1. Leonardo DiCaprio then: Evan Agostini / Getty Images He was an Academy Award–nominated actor and environmentalist who dated young models. Now: Yuriko Nakao / Getty Images He is an Academy Award winning actor and environmentalist who dates young models. 2. Oscar Isaac then: Frazer Harrison / Getty Images Starred in a religious movie. Now: Frederic J. Brown / AFP / Getty Images Starred in a religious space movie. 3. Chris Pratt then: Michael Buckner / Getty Images Starred in two popular teen dramas. Now: Kevin Winter / Getty Images The star of two multimillion-dollar film franchises. 4. Michael B. Jordan then: Paul Hawthorne / Getty Images Boy next door cuteness. Now: Alberto E. Rodriguez Man next door you thirst after. 5. Justin Timberlake then: Peter Kramer / Getty Images Didn't relax his hair. Now: Frazer Harrison Won't stop relaxing his hair. 6. Idris Elba then: Michael Buckner / Getty Images Hot. Now: John Phillips / Getty Images Still hot. 7. Jared Leto then: Peter Kramer / Getty Images An ageless emo vampire. Now: Jason Merritt / Getty Images An ageless 19th-century dandy vampire. 8. Drake then: Frederick M. Brown / Getty Images A boy. Now: Vaughn Ridley / Getty Images A man. 9. Channing Tatum then: David Livingston/Getty Images Thumby. Now: Pascal Le Segretain / Getty Images Thumbish. 10. Taylor Lautner then: Toby Canham / Getty Images Somebody get this boy a blow-dryer! Now: Matt Winkelmeyer / Getty Images Who? 11. Ryan Gosling then: Peter Kramer / Getty Images He is wearing one of those tuxedo T-shirts. Now: Jason Merritt / Getty Images He can wear me out anytime. 12. Daniel Radcliffe then: Mj Kim / Getty Images That is one baggy suit. Now: Valerie Macon / AFP / Getty Images Proof that puberty is literally the best. 13. Brad Pitt then: Evan Agostini / Getty Images Mess me up. Now: Astrid Stawiarz / Getty Images He wears purple-tinted glasses. 14. Nick Jonas then: Kevin Winter Those curls. Now: Valerie Macon / AFP / Getty Images That look. 15. Pete Wentz then: Mark Davis Weird hair. 16. Now: Jesse Grant Weird hair. 17. Jon Hamm then: Frazer Harrison / Getty Images Interesting suit but still would do. Now: Pascal Le Segretain / Getty Images Interesting hairstyle but still would do. 18. The Rock then: Peter Kramer / Getty Images The best. Now: Ilya S. Savenok The best. 19. David Beckham then: Denis Doyle / Getty Images Jesus Christ that hair. Now: Alex Livesey / Getty Images Aging surprisingly well for a white dude. 20. Bradley Cooper then: Scott Gries / Getty Images Cute. Now: Nicholas Hunt / Getty Images Hot. 21. Zac Efron then: Patrick Riviere / Getty Images Just another Disney Channel teen. Now: Vem / VEM/SBMF/FAMEFLYNET PICTURES Just another thirst trap.