1. Taylor Swift Michael Buckner / Getty Images, Rich Fury / Getty Images Turns 30 on: December 13thTaylor was only 16 years old when she released her first single, "Tim McGraw", and she's even more successful than ever after she spent 2018 travelling the world with her record-breaking Reputation Stadium Tour. 2. Daniel Radcliffe Nicolas Asfouri / AFP / Getty Images, Dominik Bindl / Getty Images Turns 30 on: July 23rdHe was cast as Harry Potter when he was just 11 years old, so if the fact that Daniel Radcliffe is turning 30 this year doesn't make you feel ancient, I don't know what will. 3. Nina Dobrev Frederick M. Brown / Getty Images, Frazer Harrison / Getty Images Turns 30 on: January 9thNina hit the big time in 2006 with her role as Mia in Degrassi: The Next Generation and, of course, she became a regular on our screens in 2009 as Elena-slash-Katherine in The Vampire Diaries. 4. Jeremy Sumpter Carlo Allegri / Getty Images, Jeremy Sumpter / instagram.com Turns 30 on: February 5thYou'll definitely remember Jeremy from his starring role in 2003's Peter Pan (and probably having a crush on him at the time). He's still acting almost 16 years later, and has a few projects coming out this year. 5. Elizabeth Olsen Jason Kempin / Getty Images, David Livingston / Getty Images Turns 30 on: February 16thYes, the Olsen twins' little sister turns 30 this year, and she's come a long way since they named their clothing line after her. Now she's an award-winning actress and Marvel's very own Scarlet Witch. 6. Corbin Bleu David Livingston / Getty Images, Tommaso Boddi / Getty Images Turns 30 on: February 21stCorbin became famous all the way back in 2006, when he starred as Chad in Disney's High School Musical. Now he's married, still acting on stage and screen, and is recording his own music. 7. Lucy Hale Frazer Harrison / Getty Images, Earl Gibson Iii / Getty Images Turning 30 on: June 14thLucy starting acting with small roles in shows like The OC, Drake & Josh, and Wizards of Waverly Place all the way back in the mid-00s, but she's most well-known for playing Aria Montgomery in Pretty Little Liars from 2010-2017. 8. Matthew Lewis Thos Robinson / Getty Images, Jeffrey Mayer / WireImage Turns 30 on: June 27thOf course, we all know Matthew as the loveable Neville from the Harry Potter movies and the inspiration behind the verb "to Longbottom". He's still acting, and got married last year! 9. Joe Jonas Barry King / WireImage, Pascal Le Segretain / Getty Images Turns 30 on: August 15thThis summer will mark 13 years since the Jonas Brothers released their first album, It's About Time. Now frontman and middle brother Joe is the lead singer of DNCE, engaged to Sophie Turner, and about to turn 30. 10. Daniel Kaluuya Frazer Harrison / Getty Images, Presley Ann / WireImage, Turns 30 on: February 24thDaniel hit British TV screens in 2007 as Posh Kenneth in Skins, and more than a decade later he's the globally famous, Oscar-nominated star of films like Get Out, Black Panther, and Widows. 11. Brie Larson S Granitz / WireImage, Frazer Harrison / Getty Images Turns 30 on: October 1stShe may be an Oscar-winning actress and Captain Marvel herself now, but back in the early '00s Brie had small roles in movies like 13 Going On 30 and Sleepover. Oh, and let's not forget her classic 2005 album, Finally Out Of P.E. 12. Nicholas Hoult Evan Agostini / Getty Images, George Pimentel / WireImage Turns 30 on: December 7thNicholas has been acting since he was tiny, but you'll probably recognise him best from his roles in About A Boy, Skins, and X-Men. He's currently making the rounds at awards shows to celebrate The Favourite. 13. Dakota Johnson Theo Wargo / WireImage, Gregg Deguire / WireImage Turns 30 on: October 6thDakota has been in the public eye her entire life thanks to her famous parents, but she found success in her own right with her role as Anastasia Steele in the 50 Shades of Grey franchise. 14. Kat Graham Patrick McMullan / Getty Images, Jean-Baptiste Lacroix / AFP / Getty Images Turns 30 on: September 5thKat was playing small roles in shows like Lizzie McGuire and The OC back in the early '00s, but you probably recognise her from her role as Bonnie Bennett in The Vampire Diaries. Most recently, she starred in Netflix's The Holiday Calendar. 15. Christopher Mintz-Plasse Patrick McMullan / Getty Images, Paul Archuleta / FilmMagic Turns 30 on: June 20thChris Mintz-Plasse became insanely famous with his first-ever role as McLovin' in Superbad, and has since had roles in Kick-Ass and the How To Train Your Dragon franchise. 16. Ashley Benson L. Cohen / WireImage, GP Images / Getty Images Turns 30 on: December 18thAshley had small, blink-and-you'll miss them parts in movies and shows like 13 Going On 30, The OC, and Zoey 101 before she hit the big time in 2010 with her role as Hanna Marin in Pretty Little Liars. 17. Chord Overstreet Jeffrey Mayer / WireImage, Presley Ann / Getty Images Turns 30 on: February 17thAfter appearing in an episode of iCarly, Chord got his big break as Sam Evans in Glee. He's since starred in films like Kick-Ass, A Warrior's Heart, and 4th Man Out. 18. Lily Collins Jeffrey Mayer / WireImage, Joe Maher / Getty Images Turns 30 on: March 18thShe's the daughter of Phil Collins, so it's fair to say Lily's been in the public eye for the majority of her almost-30 years. She started acting in 2009 with roles in The Blind Side and 90210, and has been killing it ever since. 19. Aly Michalka Jeffrey Mayer / WireImage, Presley Ann / Getty Images Turns 30 on: March 25thAs well as starring in Phil of the Future, Aly released her first album, Into The Rush, with her sister AJ in 2005. They had a huge hit with "Potential Breakup Song", and Aly has had roles in Easy A, Hellcats, and iZombie. 20. Lily James Mike Marsland / WireImage, Samir Hussein / WireImage Turns 30 on: April 5thLily started acting in 2010 after graduating from the Guildhall School of Music and Drama, and hit the big time in 2015 as the lead role in Cinderella. She's since been in Baby Driver, Darkest Hour, and, of course, Mamma Mia 2. 21. Alia Shawkat SGranitz / WireImage, Astrid Stawiarz / Getty Images Turns 30 on: April 18thAlia Shawkat has been gracing our screens since she was 10 years old, but she got her real big break in 2003 with her role as Maeby Fünke in Arrested Development. She's also had starring roles in Whip It, The To Do List, and The Final Girls. 22. Phoebe Tonkin Vittorio Zunino Celotto / Getty Images, John Shearer / Getty Images Turns 30 on: July 12thYou'll probably recognise Phoebe from her frankly iconic role as Cleo in H2O: Just Add Water. Since then, she's had starring roles in shows like The Secret Circle, The Vampire Diaries, and The Originals. 23. Juno Temple Dave M. Benett / Getty Images, Mike Marsland / WireImage Turns 30 on: 21st JulyJuno was the ultimate British quirky girl in the mid-'00s after starring in films like St Trinian's and Wild Child. She's been killing it in Hollywood ever since, with roles in huge movies like The Dark Knight Rises and Maleficent. 24. Hayden Panettiere Ron Galella / WireImage, Roy Rochlin / FilmMagic Turns 30 on: August 21stHayden has been in the public eye since before her first birthday — she appeared in her first commercial when she was 11 months old — but she's probably best known for her roles in Heroes and Nashville. 25. Shenae Grimes Scott Gries / Getty Images, Joe Scarnici / Getty Images Turns 30 on: October 24thShenae has been gracing our TV screens since 2004, when she got the part as Darcy on Degrassi: The Next Generation. She's probably best known for her starring role as Annie in the 21st century reboot of 90210. 26. Jason Derulo Chelsea Lauren / WireImage, Karwai Tang / WireImage Turns 30 on: September 21stIt seems like Jason Derulo and his trademark (~JaSoN dErUlOoOo~) have been on the music scene forever, and this year marks an entire decade since he released the iconic "Whatcha Say".