It's synonymous with the royal family, and is also known as the place where Prince William wooed back Kate Middleton after their 2007 split.
And now Pippa Middleton and her boyfriend Alex Loudon are jetting there for a romantic break. Where? Mustique, of course.
It is reported that Pippa is taking Alex there for some quality time together out of the spotlight.
There have been rumours that the couple's relationship has been under strain following the overwhelming press attention Pippa has received since the royal wedding.
A source said: 'They've struggled since. They're still together but need time alone. Pippa hopes this break will get them back on track.
'After all, it worked for Kate when she and Wills hit the rocks in 2007.'
Mustique is a favourite with Mick Jagger and Kate Moss and was a bolthole for Princess Margaret, the Queen's sister.
It is also the favoured holiday spot for the Middleton family, who've been enjoying visits to the island for years. They even invited locals from the Caribbean hotspot to Kate's wedding, and it has also been reported the family are considering buying a holiday home there.
See Pippa Middleton on holiday around the world: