Then: The blue eyed, dreamy moral compass of game-changing teen drama Beverley Hills 90210, and star of the music video for I Drove All Night.

Now: A little more rugged around the edges, Priestley is currently starring in Canadian TV series Call Me Fitz, about a morally bankrupt car salesman forced to become business partners with his inner conscience.

Then: Played the auburn-haired angsty teenager Angela in 'My So-Called Life

Now: Playing blonde-haired troubled CIA officer Carrie in excellent TV drama Homeland.

Then: Our number 1 TV crush, bad boy Jordan Catalano in My So-Called Life

Now: Sports a mohawk, is in the band 30 Seconds to Mars, and has a website called Notes From the Outernet

Then: The cherubic pre-teen pop sensation was known for hits Crazy Little Party Girl Crush on You and I Want Candy, before dating Lindsay Lohan and Hilary Duff in his teens

Now: Was arrested for speeding, appeared on Dancing with the Stars and is recording his new album The After Party

Then: Played artistic, sarcastic teen Darlene in Roseanne - had an excellent collection of check shirts.

Now: She has appeared in The Big Bang Theory, and is co-host and executive producer of The Talk, a chat show also starring Sharon Osbourne.

Then: Blonde, long-haired brother Hanson shot to fame with single MMMbop in 1997, and their debut album Middle of Nowhere sold 10 million copies worldwide.

Now: Still releasing material, in 2012 the band toured with Canadian teen star Carly Rae Jepsen.

Then: Cheeky chappies PJ and Duncan were the stars of Byker Grove, (who could forget the freak paint-balling accident storyline) and went on to release hit pop singles such as U Krazy Katz and Let's Get Ready To Rhumble

Now: Known by their true names, Ant and Dec, the award-winning duo have presented pretty much every hit talent/game show on ITV, bar The X Factor.

Then: The star of weepy sleepver classics My Girl and My Girl 2

Now: The star of sweary, hilarious political satire Veep

Then: The long-haired one on alien-themed sitcom 3rd Rock from the Sun - and a few years later - the nerdy nice one (who gets the girl) in 10 Things I Hate About You

Now: Inception, The Dark Knight Rises, Looper - Joseph became a bona fide movie star, via indie flicks like 500 Days of Summer

Then: With their jaunty hat choices, hilarious parents Lisa and Ray, and boy troubles ("Go HOME Roger!"), Tia and Tamera in Sister Sister were our favourite teen twins on TV (aside from Sweet Valley High).

Now: The twins are now reality TV stars - with their own reality show Tia and Tamera on the Style network in the US.

Then: Starred as Jessica and Liz Wakefield in the TV series of Francine Pascal's Sweet Valley High books. Had amazing 90s style and a catchy theme tune.

Now: Cynthia retired from acting after the show was cancelled and became a photographer. Brittany has appeared in Dawson's Creek, That 70's Show, and It's Always Sunny in Philadelphia

Then: The blonde-haired, wise-cracking star of Saved by the Bell, Zach Morris.

Now: Brown-haired star of legal comedy Franklin & Bash. Competes in triathlons.

Then: Dustin played goofy, loveable class geek Screech in the Saved by the Bell TV series and various spin-offs.

Now: After the show, Dustin became a touring stand-up comic, starred in his own sex tape scandal, appeared on various reality shows and released a tell-all book Behind the Bell.

Then: The star of two classic teenage TV shows - Clarissa Explains It All and Sabrina the Teenage Witch

Now: Stars in TV series Melissa and Joey with Joey Lawrence - who was also in hit teen show Blossom.

Then: The star of TV series The Secret World of Alex Mack, films 10 Things I Hate About You and The Babysitters Club.

Now: Appeared in Mad Men as Cynthia Cosgrove.

Then: Played a child genius/ teenage doctor in Doogie Howser, M.D

Now: Plays womanizing Barney Stinson in How I Met Your Mother

Then: Heartbreak High was a gritty Aussie teen drama, and Callan played rebellious, roller-blading hearthrob Bogdan Drazic.

Now: Callan had to have extensive facial surgery after a horrific car crash in 2003. His acting career continued, however, and he's still a huge star in Australia thanks to crime show Underbelly.

Then: Played Scott in Neighbours, before becoming a pop sensation - his debut album Ten Good Reasons was one of the highest-selling albums of 1989.

Now: After battling with a drug problem throughout the 1990s, Jason is now still releasing albums, has a radio show on Heart FM and was a judge on ITV's Superstar this year.

Then: Another Neighbours heartthrob - Jesse played Billy, Doctor Carl Kennedy's son

Now: Jesse moved to LA and won a major role in TV series House

Then: Before she became an international pop icon, Kylie started out as girl-next-door Charlene on Neighbours

Now: Need we explain how things turned out?

Then: Mayim tap-danced her way into our hearts in teen sitcom Blossom.

Now: She's Dr. Amy Farrah Fowler in The Big Bang Theory

Then: Michelle started out as cynical, 'out of control' city girl Jen ( Joey's rival), on Dawson's Creek.

Now: An academy award nominated actress for roles such as My Week with Marilyn and Blue Valentine.

Then: Molly was the girl in the 80's Brat Pack gang we all wanted to be, thanks to her roles in Pretty and Pink and The Breakfast Club

Now: She plays a mother in American drama The Secret Lives of an American Teenager

Then: He first caught our eye in performing arts drama The Biz, before progressing to full on teen heartthrob status in Eastenders.

Now: The curtains have gone, and now he's starring in dramas like Law and Order: UK and Holby City.

Then: He was the Brat pack heart hrob every girl in the eighties loved, even with a mullet. Plus he played a mean saxophone in St Elmo's Fire.

Now: His piercing blue eyes returned to our screens (but his mullet didn't) in The West Wing, Brothers and Sisters and Parks and Recreation.