He's had 47 years to make sure he knows his own birthday, but Peter Andre has recently discovered that he might have the date wrong after all.
The singer and TV star shared some shock news with fans on Instagram - his birthday actually appears to be seven months later than he'd spent his whole life thinking it was.
Andre celebrates his birthday on 27 February, but he posted photos to Instagram of a find that had shaken him to his core - his childhood passport says that he should actually have been getting the candles out on 27 September instead.
Posting pictures of the old document that includes a photo of him as a child and the different date, he wrote: "Erm for 47 years I thought I was born on 27th February. What is going on.......? How old am I? Who am I?
"This is my old passport when I was supposedly 9 years old. Was I 10? Was I fifteen? Am I 103 right now?"
The dad-of-four then posted a zoomed in snap of the passport photo captioned: "Me at 9..... supposedly????
His passport lists his place of birth as London, England, but his residence as Australia as the family moved from Harrow to Sydney when he was nine - the age at which the surprising passport was issued.
Andre, who now lives in the UK again with his wife Emily, recently posted a house tour of their mansion on YouTube showing off their luxury home and Christmas decorations.
His ex-wife Katie Price spoke last month about the couple's "proper love story" after meeting on the 2004 series of I'm A Celebrity...Get Me Out Of Here!.
British Prime Minister Tony Blair talks to singer Peter Andre during the EU enlargement: Unification of Europe - VIP Party, to celebrate the entry of 10 new countries into the European Union, at the Foreign and Commonwealth Office in London. Where Mr Blair launched the Crossroads for Ideas initiative, a joint project between the Foreign Office and the British Council. The scheme will bring some of the most talented young professionals from Central Europe - working in television, fashion, design, architecture, science, the environment and finance - to meet their British counterparts to exchange ideas, experiences and skills.
Pop stars Peter Andre (left) and Robbie Williams in London today (Thursday) before appearing at this evening's 1996 MTV Europe Music Awards. Williams, formerly of Take That, will be hosting the awards, whilst teen heart-throb Andre will be performing in the show. Photo by Michael Stephens/PA.
Former Take That star Robbie Williams (bottom left) and pop star Peter Andre (bottom centre) join members of the Irish pop band Boyzone for a photocall prior to the 1996 MTV Europe Music Awards in London. Williams will host the show * Boyzone (l-r) Stephen Gately, Ronan Keating, Shane Lynch, Keith Duffy (seated, Nike cap) and Michael Graham.
FOR EDITORIAL USE ONLY. Pop Star Peter Andre, who has recently hit the charts with his new singler All About Us, after he had his hand cast today (Tuesday) at the Rock Circus 'Wall of Hands' in conjunction with the Coca Cola Thirst For it Competition. Photo by Ben Curtis/PA
Former Take That stars Robbie Williams (right) and Gary Barlow (2nd left) line up with Peter Andre and Channel 4's Big Breakfast presenter Denise Van Outen, for the finale of tonight's (Sunday) Concert of Hope, at London's Battersea Power Station. Proceeds from the annual concert will benefit the Diana, Princess of Wales Memorial Fund. See PA story DIANA Concert. Photo by Fiona Hanson/PA
Glamour model Jordan with her parents Amy (far left) and Paul (centre left) and her boyfriend, singer Peter Andre arrive at Gordon Ramsay's temporary restaurant in Brick Lane, east London for 'Hell's Kitchen', the ITV reality cooking show with celebrities manning the kitchen . Hosted by Angus Deaton, the show sees the worst chefs voted off by the public.
Jordan and Peter Andre during the Glamour Women Of The Year Awards at Berkeley Square in central London - the first annual award ceremony held by the women's magazine.
Peter Andre and Jordan at the BRMB Party in the Park, Cannon Hill Park, Birmingham. Doug Peters/allactiondigital.com
A pregnant Jordan and boyfriend Peter Andre arriving at the European Premiere of House of Wax, Leicester Square, London.
Peter Andre and Katie Price at the The BBC Radio 1 Chart Show Live, which is being held at the Brighton Dome, Brighton.
Katie Price and Peter Andre leaving the High Court in London after winning thier libel case against the News Of The World.
Peter Andre and girlfriend Emily MacDonagh arriving at The National Television Awards 2013, The O2 Arena, Greenwich, London.
Peter Andre and Emily MacDonagh attending the Caudwell Children Butterfly Ball, held at the Grosvenor House hotel in London.
Ed Sheeran and Peter Andre at the Nordoff Robbins O2 Silver Clef Awards at the Grosvenor House, Park Lane. (Photo by Keith Mayhew / SOPA Images/Sipa USA)
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Talking about the romance on a lookback show at 20 years of the contest, she said: "It was a proper love story and I think me and Pete are the only ones who had kids come out of it.
"I was 23, I had no idea I'd go into the jungle and meet my husband."