From Geek To Chic: 18 AMAZING Celebrity Transformations We ALMOST Can't Believe

1. Harry Styles

While One Direction as a whole have definitely gone from geek to chic over the past four years, it's heartthrob Harry Styles who's transformed the most. What used to be a plethora of hoodies and plain tees has now been replaced with pinstripe suits, rock star bananas and tattoos. Picture: PA/Rex

2. Ariana Grande

We love Ariana circa 2009 during her Victorious days, when she was just an adorable rising teen star more comfortable in jeans and tees then ball gowns. But we REALLY love 2015 Ariana, who can rock the hell out of a red carpet dress like no one else. Our Ariana's all grown up! Picture: PA/Getty

3. Miley Cyrus

Back in her Hannah Montana days Miley was the butter-wouldn't-melt All-American girl. Fast-forward to 2014 and she's become an unstoppable bum-twerking, tattoo-loving controversy-courting pop phenomenon. As transformations go, it's not the worst. Picture: PA/Getty

4. Justin Bieber

He's the man that inspired Geek To Chic, after his INCREDIBLE transformation for the Calvin Klein photoshoot. Biebs has gone from a wavy haired, purple hoody-wearing teeny-bopper to an absolute HUNK. Justin, we salute you! Picture: PA/Getty

5. Rihanna

In 2005, when Rihanna's first single 'Pon De Replay' arrived, the future Bajan superstar was a fresh-faced 18 year-old singer more likely to wear bell-bottomed jeans than vamp things up like she does today. In fact it's pretty hard to believe these are two pics of the same woman. Rihanna, you've changed! Picture: PA/Getty

6. Ellie Goulding

By no means are we saying Ms. Goulding looked geeky in her eye-catching outfit at the BRIT Awards 2010 in this snap. But when you see Ellie walking those red carpets these days it's clear the superstar has evolved in every way, from her confidence and charisma to her amazing sense of style. This is one pop star who's TOTALLY comfortable in her own skin. Picture: PA/Getty

7. Little Mix

2011 saw the four ladies from Little Mix win The X Factor UK and get thrust into the spotlight immediately after. The girls have always had a good fashion sense, but when you see them these days Perrie, Leigh-Anne, Jade and Jesy have developed their own individual styles and personalities through their fashion. Plus... they certainly know when to vamp things up! Picture: PA/Getty

8. Victoria & David Beckham

Granted it was the nineties, but when you look back at pics of the Beckhams from their early days as a power couple it's hard to believe just how much this pair have gone up in the fashion stakes. You wouldn't catch posh and becks in those matching leather outfits these days, that's for sure. (And give us noughteens David over nineties Becks ANY day). Picture: PA/Getty

9. Katy Perry

K-Pez has always maintained that she's the same Santa Barbara gal at heart that she's always been and, while that's definitely true when you watch her in interviews, luckily her style hasn't stayed the same as it was in the early days of her pop career. Now Katy's all about chic dresses, picture-perfect make-up and making a BIG statement with her hair. Picture: PA/Getty

10. One Direction

It's hard to believe that in just 'FOUR' years One Direction have gone from casually dressed fresh-faced boys to suave, suit-wearing superstars. Between them these chaps have #Chic well and truly covered! Picture: PA/Getty

11. Kim Kardashian

Kim Kardashian is now one of the world's LEADING fashion muses, with everything she wears seemingly creating a fashion phenomenon the world over. But, as we can see, it wasn't always like that... Picture: PA/Getty

12. Cheryl

Our Cheryl may well be a fashion inspiration to many these days, but back in her Pop Stars: The Rivals days the young lass was more comfy in baggy jeans and a cropped top. It's hard to believe these two pics are of the same lady! Picture: PA/Getty

13. Taylor Swift

When Taylor first arrived onto the scene she was a slightly shy country-pop girl with more than a little awkwardness when she hit that red carpet. Fast-forward from 2006 to 2014 and Taylor is MORE than comfortable with all eyes on her, and she's got a tres chic sense of style to go with it. The lady has arrived! Picture: PA/Getty

14. Selena Gomez

'Come & Get It' superstar Selena Gomez started out as a typical teen pop princess on Wizards Of Waverly Place back in 2007. It's AMAZING to see her transformation from shy girl-next-door to vamped up superstar with killer looks and an attitude to match. You done good, SG! Picture: PA/Getty

15. Kendall & Kylie Jenner

When the world first fell in love with Kim Kardashian, her younger half-sisters Kendall and Kylie were so young and innocent - it's hard to believe they're become veritable superstars in their own right, rarely out of the newspapers and even hitting that catwalk themselves! Picture: PA/Getty

16. Calvin Harris

When Calvin first arrived on the scene with 'Acceptable In The 80s', he had an unruly mop of hair, an obsession with neon t-shirts and was as shy as they come. Mr Harris is now pretty much unrecognisable with his new model good looks, penchant for very chic suits and a newfound confidence that only comes when you know you're one of the world's BIGGEST DJs. Picture: PA/Getty

17. Britney Spears

The original Pop Princess has gone through some BIG transformations through the years and it's AMAZING to see how much her style has evolved. Picture: PA/Getty

18. Demi Lovato

'Really Don't Care' singer Demi turns heads whenever she hits that red carpet and has a unique sense of style that only she can pull off. Dressing to showcase her incredible figure, Demi isn't afraid to stand out in a bold colour and a quirky hairdo. Top marks! Picture: PA/Getty