After a mere 25 days in the Caribbean on his £30million yacht, his holiday has drawn to an end.
It's the first time he's been to the UK since September when he left for the USA to work on America's X Factor.
While he was soaking up the sun in the West Indies on his 196ft luxury yacht, Slipstream, he entertained a string of stars, including Swedish supermodel Victoria Silvstedt, his best friend Sinitta, and millionaire divorcee Zeta Graff.
His winter holiday began at Christmas, when he flew to Barbados. He stayed at luxury apartment complex The Sands on the west coast where he was snapped whiling away the time on a jetski.
He then flew to St Barts in the West Indies where he chartered the Slipstream for two weeks. According to the Daily Mail, the yacht is usually hired out at £323,000 per week.
Simon has come back in time for the next series of Britain's Got Talent. Auditions started today in Manchester.
Which other celebs can't resist a holiday? Check out our gallery!
Celebrities on holiday around the world
Aww, poor thing! Simon Cowell's 25-day Caribbean holiday finally ends
Nicole Richie shows off newly curvaceous figure as she holidays with DJ Sam Ronson and rocker Juliette Lewis in Los Cabos, Mexico, in September.
Ex-EastEnders star Lacey Turner showed off her gorgeous figure in a spotty blue bikini as she enjoyed the pool at the upmarket Mondrian Hotel in Miami, where she stayed with her boyfriend, Matt.
Located on the fashionable West Avenue, the Mondrian is a modern hotel just minutes from the centre of South Beach, and offers beautiful views over the Atlantic Ocean and Biscayne Bay.
Anne Hathaway went retro fifties on a romantic summer holiday to the Italian island of Capri with her jewellery designer beau Adam Shulman. The pair enjoyed exclusive use of fashion mogul Valentino Garavani's yacht.
The Prime Minister enjoyed a two-week holiday at a £10,000 a week villa in Tuscany in August. The pair were snapped enjoying a coffee at the Dolcenero cafe in the town of Montevarchi.
While Victoria Beckham was resting at home with new baby daughter Harper Seven in July, David Beckham took the opportunity to treat Brooklyn to a surfing lesson at the beach in Malibu - and got some snaps for the family album while he was at it.
She's well known for her strict exercise regimes and diets, and Gwyneth Paltrow's years of 'good behaviour' have obviously paid off as she showcased a stunning bikini body in Sardinia in July 2011. The actress enjoyed a family holiday in Italy with her children Moses, five and Apple, seven, and her godfather, legendary director Steven Spielberg. They all stayed on his £200 million luxury yacht, and were spotted leaping off the back and playing on inflatables in the water.
She may have been at the height of her supermodel fame in the 90s, but Helena Christensen still looked the part as she went swimming in a bikini in Ischia in July 2011. The model-turned-photographer was on holiday in Italy for the Ischia Global Festival, which the likes of Karolina Kurkova, Gerard Butler and Leonardo DiCaprio also attended.
Girls Aloud star Sarah Harding showed off her slim figure - and newly-lightened locks - in a strapless snakeskin bikini teamed with a funky-chunky cuff in Ibiza in July 2011. Sarah enjoyed a holiday on the party island with her DJ partner Tom Crane.
Kelly Brook visited Italy for the Ischia Global Film and Music Festival in July 2011. The 31-year-old actress/model was looking glamorous in a printed fifities-style Jasper Conran prom dress and plimsoles, teamed with a rather posh Louis Vuitton handbag. She readily settled into the glamorous lifestyle by enjoying a trip on a yacht, before munching a holiday ice-cream and shopping for local souvenirs.
Former governor of California Arnold Schwarzenegger enjoyed a scenic bike ride in Salzburg with friends on a June 2011 holiday his home country, Austria. Over 170 kilometres of attractive cycle paths with 900 signs, 23 scenic bicycle routes through the city, 5,500 parking spaces and self-service stations offering free tools, bike stands, lubricating oil and compressed air for emergencies make Salzburg Austria's number one cycle city.
New mum Abbey Clancy certainly knows how to relax on holiday. Pictured here enjoying the balmy weather in sunny Sardinia (June 2011), Abbey was taking a pre-wedding break with fiance Peter Crouch and their baby daughter Sophia . The couple are staying at the four-star Sheraton Porto Cervo Hotel, which boasts its own private beach on the exclusive Costa Smerelda.
Former Spice Girl Geri Halliwell is pictured here enjoying a family holiday in the south of France (June 2011). Geri looked happy and relaxed as she lazed on a private yacht with boyfriend Henry Beckwith and five year old daughter Bluebell. The yellow polka dot bikini she's wearing here is part of her own collection from high street store Next.
Adriana de Moura looked pretty in pink as she frolicked and sunbathed on Miami's South Beach (March 2011). It's clear the Brazillian star takes care of herself, and she's not just a pretty face. The Brazililan star claims to speaks five languages, she's a full time mum and a respected art curator.
Why Miami? For glitz, glamour and nightlife, Miami is the place to be. Perfect for all socialites in need of a tan
Gwen Stefani showed off her wash-board abs as she soaked up the sun on luxury yacht Luna in St Jean Cap Ferrat, Cote d'Azur in May 2011. Why here? A more pertinent question might be: why not? Its stunning scenery, high-end boutiques and fabulous restaurants are a honeypot for the rich and famous.
Here's Naomi Campbell looking cool and relaxed in Miami Florida. The supermodel was spotted having a long lunch with Russian businessman Vladislav Doroni in March 2011.
American singer Taylor Swift certainly knows how to let her hair down. She's pictured here on a holiday in the paradise archipelago of the Bahamas in February 2011.What's so special about the Bahamas? This place could go under the word 'paradise' in the dictionary: think miles of talcum powder sand, the world's third largest barrier reef, not to mention some of the world's friendliest people...
Aah, aren't they sweet? This pic of the tennis star cuddling up with his wife Lilly on a sunbed was taken when they took a family holiday in Miami (spring 2011) with their son Amadeus.
Former party girl Zoe Ball looks quite the yummy mummy in Miami, Florida as she takes son Woody for a spin on a jet ski.Miami beach is a particularly popular holiday destination for families, with its spectacular beachfront hotels. And it's great for watersports lovers, too.
French model Noémie Lenoir relaxed in Florida in March 2011. Noémi, who appeared to be taking a solo holiday, laughed and joked with pool attendants and appeared relaxed happy and healthy again after a tumultuous year. The former M&S lingerie model hit the headlines a while ago after a suicide attempt following her split with footballer Claude Makélélé, the father of her six year old son. But all that now seems a lifetime ago. Like many celebs, she has picked Miami as the place to chill out and soak up some sun. And who can blame her? Florida is a perfect place to go for an easy winter getaway...
Cat Deeley is pictured here taking a break from a hectic schedule to top up her tan in Capo, Mexico. She has been presenting So You Think You Can Dance Stateside, spending much of her time jetting between LA and London, so she was grabbing the chance to chill. What's so good about Mexcio? Cat picked a great spot: from the archaeology of the Mayan ruins to Cancun's famous beaches and nightlife, Mexico - land of amazing food and tequila - is the perfect place for letting your hair down.
Courteney Cox looks relaxed as she sits on the beach in Hawaii, taking a break from shooting scenes for her new TV comedy, Cougar Town. The star jetted off to Oahu with her co-star Brian Van Holt (with whom she is rumoured to be having a new relationship). Why Hawaii? Beaches, parties, nightlife... go here for some hedonistic fun!
Actress and Bond Girl Denise Richards rocks the beach babe look in Hawaii. The former wife of Charlie Sheen is pictured here making a splash. She was on holiday with her two daughters and her father but the absence of her new man, musician Nikki Sixx, led to tabloid rumours that the pair had split... Why here? This Pacific Ocean paradise offers year-round sunshine and arguably some of the best surfing in the world.
It looks as if love is in the air for model Rosie Huntington-Whiteley and her British beau Jason Statham spend time chillaxing St Bart's on holiday. What's so special about St Barts? A hit with A-listers and VIPs, this island is known as the pearl of the Caribbean. Expect to spot iguanas, luxury yachts, exclusive designer boutiques and a Hollywood starlet or three...
Former Sporty Spice Melanie Chisholm was spotted taking to the water with daughter Scarlet, nearly two years old, while on holiday in Barbados. Mel was taking a break with partner Thomas Starr before she started work on her fifth solo album.
American model and actress Olivia Palermo seems to be having the time of her life in St Barts as she gets a lift along the the beach from her boyfriend Johannes Huebl.Known as the millionaire's playground, St Bart's has everything to offer for a romantic holiday, from chic luxury accommodation, gourmet cuisine, crystal clear tropical waters and endless sandy beaches. A hit with honeymooners, you can drive round the entire island in 90 minutes.
Girls Aloud star Sarah Harding and DJ Tom Crane are pictured here arriving home from a romantic holiday in the Maldives, during which they got engaged. Tom popped the question on New Year's Eve then took to Twitter to tell his followers: 'I feel like the luckiest man in the world!!!'. What's so special about the Maldives? This chain of 1,200 mostly uninhabited islands in the Indian ocean offers a tropical paradise for beach lovers. For more, see fab review of the W Hotel Maldives, where Kate Moss was spotted!
Tennis champ Serena Williams, who is pictured here recovering from injury earlier this year, appeared to be back to her old self as she took a holiday with friends in Miami, Florida. The 29-year-old tennis player has been sidelined from her sport since claiming her 13th Grand Slam title at Wimbledon last July. Why Miami? It's the perfect place to visit with your mates: go there for sun, fun and some serious downtime.
Jeremy Clarkson and his wife of 18 years, Frances, put on a united front as they had fun in the sun on a Barbados beach amid rumours he is having an alleged affair. The Top Gear presenter and his wife, who is also his manager, were seen hitting the jet skis and a speedboat as they enjoyed the high life in the Caribbean paradise. Why Barbados? If you love to be active, this is your perfect destination. Watersports lovers beware: you'll never want to leave...
Charlotte Church was being unusually bashful as she soaked up the sun poolside in LA. The singer and TV host was spotted relaxing at the Beverly Hills Hotel, but covered up her monochrome bikini with a loose grey vest top. The singer was on holiday with her children, daughter Ruby Megan, three, and two-year-old son Dexter Lloyd, who she shares with her former partner Welsh rugby international Gavin Henson. The 25-year-old was on mummy duty at the pool, armed with children's floats and a Spider-Man toy.
Coleen Rooney showed off an array of different bikinis on her June 2011 holiday to Barbados. Her cornflower-blue two-piece was particularly pretty and just happened to match her son Kai's beachwear, too.
Presenter and model Abbey Crouch showed off her streamline figure at the swanky Le Royal Meridien Beach hotel in Dubai, where she enjoyed some family time with hubby Peter and 15-month-old daughter Sophia. Yummy mummy alert!
Denise jetted off to the Grosvenor House Hotel in Dubai for a girly weekend. Looks like she still has her infamous 90s figure in tact! Just how does she do it??
And they call her 'The Body' because... Ah yes, here's why. Elle turned heads when she went for a surf in Byron Bay back in December 2011.
LeAnne Rimes took to the beach and flaunted her new super-streamline figure back in August 2011.
Gwyneth Paltrow showed off the benefits of a strict diet while on holiday in Porto Cervo, Sardinia.
Whether she's emerging from the sea in a Bond movie or taking a jog along the sand with her daughter, Halle Berry never fails to look beach-beautiful.
Kelly Brook had a Bond girl moment as she emerged from the ocean in a gold-accented purple swimsuit while on holiday in Mykonos, Greece, in June 2011. The actress/model was enjoying a romantic holiday with her rugby-playing boyfriend Thom Evans, where they were snapped lazing on the beach, splashing in the sea, and taking pics for their holiday album.