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Remember when Robbie was in Take That the first time? And Britney and Christina were the biggest stars in pop? Take a tour down hit music memory lane with our look at music stars then and now.
Here's Robin back in 2003, when the thought of releasing a smash hit like 'Blurred Lines' was just a dream.
And here he is now - still smiling, just less hair!
Now Cheryl's one of the most stylish women in music, but it was a very different looking 'Call My Name' star who burst onto the music scene with Girls Aloud at the start of the century.
Cheryl's grown into one of the most idolised women in the UK and alongside the (now defunct) Girls Aloud, has developed a big following of Soliders as a solo star. At one point she was also a judge on The X Factor. Picture: PA Photos
Miley Cyrus arriving at her 16th birthday party.
And here's Miley Cyrus now, attending a red carpet event in America. Hasn't she changed!?
Here's a young Pitbull in a day when he was just dreaming of becoming Mr. Worldwide.
And here's Pitbull now - officially one of the biggest pop stars on the planet!
Back before she hit the big time with her debut album 'Our Version Of Events' Emeli had a very different look! Picture: Music Pictures
Emeli has dropped the big hair in favour of a platinum blonde quiffed 'do and looks utterly fabulous as a result!
Remember Frankie's first group? She was a member of the S Club Juniors in the early noughties. The spin off from S Club 7 also featured a fellow The Saturdays star, Rochelle Wiseman.
Hasn't she changed!? Frankie's become one of pop's most glamorous stars - and has even bagged herself a footballer boyfriend, Wayne Bridge!
When Calvin first burst onto the scene he had left his job stacking shelves at Marks & Spencer in a bid to become a music star. The fresh-faced twenty-something struck it big with the release of his debut single 'Acceptable In The 80s'...
But it's the more mature - and frankly, hotter - looking Calvin Harris that has really made it big. After making the decision to shun live performances, Calvin wrote and produced 'We Found Love' for Rihanna and the rest, as they say, is history.
When she first burst onto the music scene with 'Do it Like A Dude', Jessie officially made the bob hairstyle famous.
Now a certified superstar, Jessie recently shaved her hair off for charity and is currently rocking the number one buzzcut in pop.
Here's an innocent looking RiRi in 2005, when she was literally on the cusp of the stardom we know her for now.
And here's Rihanna now! Officially one of pop's most glamorous stars, she continues to push boundaries - both in the studio and on stage. Not to mention her fashion collection for River Island!
Katy Perry initially made Christian music when she first decided to launch a music career under her real name Katy Hudson. Now...
... she looks like this! Another of pop's megastars, the 'California Gurls' star is an icon to millions of girls - and boys - around the world.
Here's a slightly thinner Chris Brown back when he was just starting out his music career.
And here's Chris Brown now, a man who literally has everything! Cars, clothes, a huge library of hit music and, of course, Rihanna!
Here's Pink at the Billboard Music Awards in 2000, when she kick started her career in music with hits like 'Most Girls' and actually had Pink hair!
Now a blonde, Pink continues to be one of the biggest live draws on the planet and is currently touring the world on her 'The Truth About Love' tour. Picture: PA
Remember when Britney was all about the pink boob tube and matching leather trousers?
Now a mother of two, Britney's style has matured over the years, but she remains one of the biggest pop stars in the world.
Here's Justin Bieber at the very start of his music career. Who can forget that hair?
And here's Justin now, rocking a rock star quiff and a camo shirt. In just five years, Justin has built an army of Beliebers around the world and is currently entertaining all his fans on his 'Believe' world tour.
Remember when Robbie was just a boy from Stoke who also happened to be in the biggest boyband in Britain? Here's the 'Let Me Entertain You' singer when he was one fifth of the original TT line-up.
After breaking away from Take That in the mid-90s, Robbie launched a music career that made him the UK's biggest solo male singer since George Michael. He recently rejoined Take That for their latest album 'Progress' and is now on good terms with his old bandmates.
Here's Beyonce rocking some camo way back in 1998, when she was best known as a member of Destiny's Child.
After breaking away from Destiny's Child, Beyonce embarked on an ambitious solo career that's helped make her the biggest American pop star on the planet. She's married to Jay-Z and the couple - together - are among the most powerful of pairings in the US.
Here's Fergie when she was just starting out as a member of Black Eyed Peas...
And here's the LBD-wearing glamorous pop starlet now. Looking better than ever!
Rewind a few years and Tulisa was just setting out on her music career as a member of N-Dubz...
Now she's a judge on The X Factor, not to mention a solo star in her own right.
We showed you Frankie, so it's only right we show you her S Club Juniors band mate Rochelle Wiseman at the beginning of her career.
And here she is now! Rochelle is now a member of The Saturdays and married to Capital FM presenter and JLS star Marvin Humes. The couple are currently expecting their first child together.
Here's Adele in 2008, shortly after the release of her debut album '19'. Who would have guessed what happened next...
What a difference five years can make. In that time the South Londoner has become one of the most successful British solo artists of all time, enjoying success around the world with her second album '21'. She recently welcomed the birth of her first child and even sang the James Bond theme for 'Skyfall', which bagged her a Golden Globe AND an Oscar.
It was all about the Tommy Hilfiger dungarees for Justin Timberlake in 1997, when he was one fifth of N*Sync.
Now Justin's still making the world 'Pop', but as a solo star. He recently released his third album 'The 20/20 Experience' and is as suave as they come thanks to a hook-up with Tom Ford.
Here's Will.i.am in 2003 when his hair was long and his main recording outlet was the Black Eyed Peas.
Although Will continues to dress totally dope, he's more well-known now for his solo success, which has included collaborations with everyone from Justin Bieber to Mick Jagger of The Rolling Stones!
Before Christina got all 'Dirrty' on us, she was Britney's closest pretender in the late nineties.
Now, like Britney, a fellow mother, Christina continues to reign supreme in the pop world and can be heard on Pitfull's new song 'Feel This Moment'.
Forget Britpop, PJ and Duncan were the height of cool in the mid-90s, releasing 'Let's Get Ready To Rhumble' and then...
They decided to switch to their real names and promptly became one of the biggest comedy duos in TV. Recently they enjoyed more success with 'LEt's Get Ready To Rhumble' - the track went to number one on the Vodafone Big Top 40 after they reprised it on Saturday Night Takeaway.
Here's Nicole back in the days when she was one member of the Pussycat Dolls...
And here she is now. The glamorous singer has since gone solo and is currently dating Lewis Hamilton.
Back in 1984, Madonna was just a new kid in the music industry but even then was well known for her unique approach to fashion.
Still performing and releasing albums over three decades later, Madonna is still a style chameleon like one of her biggest inspirations, Lady Gaga.
He might not have had such an extensive song library back in 1994, but one things for sure: Usher already had those abs!
Two decades on and Usher's still drives fans wild when he peels off his top during his live shows. Picture: Richard Johnson
Just seven years ago, Taylor was a small town girl with BIG ambitions...
... and now she's still a small town girl at heart, but those big ambitions have been taken care of - Taylor's officially one of the biggest pop stars on the planet. She's even dated Harry Styles!
Lady Gaga kicked off her career performing under her own name... Picture: Wenn
... and then she decided to become Lady Gaga and has since gone on to become one of the biggest stars on the planet.
Here's Liam Payne shortly after One Direction were crowned the winners of The X Factor...
...and here's Liam now with much shorter hair!