It's Mark Indelicato from Ugly Betty!
The actor - who is now 19 - looks totally different from when he first starred on the US show eight years ago. He played Betty's fashion-conscious nephew Justin Suarez on the sitcom, which aired from 2006 to 2010.
Mark is currently starring in the new thriller White Bird in a Blizzard alongside Shailene Woodley, Eva Green and Gabourey Sidibe.
Goodness gracious, look at that adorable little smile! Abigal Breslin found fame when she was just six in the 2002 sci-fi thriller Signs alongside Mel Gibson. She won a new group of fans with Little Miss Sunshine, and she's currently starring in the Oscar-nominated August: Osage County.
The little boy who saw dead people in The Sixth Sense is all grown up! Haley Joel Osment is now 25 and is currently starring in the mini-series The Spoils of Babylon with Tobey Maguire and Jessica Alba.
Now 23, Jonathan Lipnicki rose to fame in the 1996 film Jerry Maguire when he was just six. He then starred in 1999's hit movie Stuart Little but hasn't matched his early success.
Ryan Gosling began his career as a Mousketeer at the young age of 12. These days, the actor is better known as a heartthrob and movie star and has achieved critical acclaim - as well as several awards - for his roles in films such as The Notebook, The Place Beyond the Pines and Drive.
Chloe Moretz's big break came in 2005 when she starred in The Amityville Horror alongside Ryan Reynolds. Since then the teenager has racked up an impressive list of roles, including Hit Girl in Kick-Ass, Carrie in the Carrie remake and Carolyn Stoddard in Tim Burton's Dark Shadows.
Macaulay Culkin is one of the most famous child stars of all time, thanks to his roles in Home Alone, My Girl and Richie Rich. Sadly, as an adult, he has failed to reach those same heights again and has had well-publicised legal battles regarding drug possession.
Not all child stars grow up to have a career in the entertainment industry: case in point, Mara Wilson, who was one of the biggest young stars of the early nineties. She is most famous for her roles in Matilda, Mrs Doubtfire and Miracle on 34th Street. However, now in her mid-20s, Mara has shunned the limelight and focuses on writing.
In the eighties, Sean Astin was predominantly known for playing Mikey in iconic kids movie The Goonies. In the early 2000s, Sean enjoyed a second breakthrough courtesy of his role in Peter Jackson's Lord of the Rings trilogy.
OK, we're cheating a little with this one as Ralph Macchio was actually 23 when he became an eighties icon due to the Karate Kid franchise. In recent years the baby-faced actor has enjoyed bit parts in TV shows such as Entourage and How I Met Your Mother. Eagle-eyed Ugly Betty fans, however, will recognise him from his occuring role as Hilda's politician boyfriend, Archie.
Nicholas Hoult was adorable in 2002's About a Boy with Hugh Grant. Who was to know he would grow up to be such a looker? Now 24, he has starred in movies such as A Single Man and X-Men: First Class, where he met his A-list girlfriend Jennifer Lawrence. She's a lucky, lucky lady.
Drew Barrymore found fame as Gertie in E.T. the Extra-Terrestrial. Unfortunately, success at such a young age spelled trouble for the child star, who smoked, drank and became addicted to drugs in her early teens. But Drew's troubled past is well and truly behind her, and she's one of the most successful movie stars of her generation.
While we're on the subject of Saved by the Bell, what about Tiffani Thiessen, who played Kelly Kapowski? She had success in Beverly Hills, 90210 but these days she largely makes straight-to-DVD movies.
Arguably the most successful of all the Saved by the Bell cast is Mario Lopez, who went from AC Slater to big-time American TV host. He still acts these days, but is more famous for hosting X Factor and US gossip show Extra.
Elizabeth Berkley played Jessie Spano on Saved by the Bell, and is just as beautiful as she was back then. Elizabeth's only major acting role was in the 1995 film Showgirls; she also competed on Dancing With The Stars.
Ahh, Zack Morris: how we loved you so. Mark-Paul Gosselaar was a nineties teen idol. He rose to fame in Saved by the Bell but is now more famous for starring in the legal series Franklin & Bash.
Dustin Diamond, best known as Screech from Saved by the Bell, keeps busy these days with reality show appearances, including Celebrity Fit Club and Hulk Hogan's Celebrity Championship Wrestling.
Wasn't Frankie Muniz just the cutest back on Malcolm in the Middle? He doesn't act much these days after attempting a career in motorsports in 2008, and joining rock group Kingsfoil in 2012.
Malcolm's older brother Reese was played by Justin Berfield on the TV show, which aired from 2000 to 2006. He grew up to be quite a looker, didn't he? He still acts a bit, but focuses on a career as a writer and producer.
The youngest of the Malcolm in the Middle brood was boy genius Dewey, played by Erik Per Sullivan. Now aged 22, his last acting role was in 2010's Twelve.
Malcom's oldest brother Francis was played by Christopher Masterson - he looks much better with a sensible haircut! Now 34, he's a practicing Scientologist and hasn't starred in any major films or TV shows since Malcom In The Middle.
Nineties sitcom Sister, Sister was based on affable twins Tia and Tamera, who were separated at birth. The real-life twins - also called Tia and Tamera - starred on the show from 1994 to 1999. Now 35, they've each enjoyed moderate success in movies and on the small screen.