We love a dramatically visible celebrity transformation - it gives us much less successful mere mortals a shred of hope.
From Calvin Harris to Kim Kardashian West - here are ten of of the most impressive star make-overs:
1. Chris Pratt
On his Hollywood transformation and new ripped physique, the Jurassic World star has said: "I did it in a healthy way that allowed me to maintain it, rather than just crash dieting."
On his actress wife Anna Faris preferring his bigger build, he added: "She likes abs, but she likes her fat husband better, because she gets to feed him. She's a feeder and she wants to keep me locked up in the bedroom all fat and eating Kentucky Fried Chicken."
2. Calvin Harris
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Calvin Harris was unveiled as the face and body of Emporio Armani's Autumn/Winter 2015 campaign earlier this year, and has since revealed his impressive physique in nothing but the Italian fashion house's underwear via images on his Instagram page.
He also recently shared a throwback picture of himself and a mate downing shots during a night out back in 2002, which made his transformation all the more jaw-dropping.
3. Victoria Beckham
Victoria Beckham has overhauled both her image and career to become one of fashion's most lauded designers.
4. Justin Timberlake
Justin Timberlake's gone from a perm-haired, gold medallion-clad *NSYNC bopper to GQ's Best Dressed man of the year.
5. Ryan Reynolds
Mississippi Grind actor Ryan Reynolds definitely looks more Hollywood Leading Man than he did during his Two Guys, a Girl and a Pizza Place days.
6. Matthew Lewis
Harry Potter star Matthew Lewis stunned fans - not to mention one unprepared JK Rowling - when he stripped down to just his pants (and a natty old cardigan) in a risque photoshoot for Attitude magazine.
On his physical appearance, he told the publication: "I've never considered myself to be good-looking at all. Just average."
7. Noel Gallagher
Noel's never looked so dapper.
8. Ellie Goulding
We barely recognised Ellie Goulding back in 2009. She's become less girl-next-door over the years, with the star's latest photoshoot being a punk-themed one with boyfriend Dougie Poynter.
9. Blake Lively
Gossip Girl star Blake Lively has transformed herself into a fashion darling and Chanel creative director Karl Lagerfeld's muse.
10. Kim Kardashian West
Kim Kardashian West almost looks like a completely different person back in 2006. She's gone from reality TV star to coveted Vogue cover girl over the years.
