Titanic is back in theaters today! It's hard to believe that it was fifteen years ago that the iconic movie first crashed (sorry, bad pun) onto movie screens.

In honor of the film's re-release and the adorableness that was and will forever be Leonardo DiCaprio, we're taking a look at the biggest movie star heartthrobs -- and the movies that catapulted them to stardom -- from Leo back in 1997 all the way through today!

Did your favorites make our list? Find out after the jump!

Rumors are swirling that Glee beauty Dianna Agron has been getting quite cozy with actor Sebastian Stan over the past couple weeks!

US Weekly is reporting that Dianna and Leighton Meester's ex-boyfriend have been getting to know each other, and a souce tells the mag, “They’re cute. Dianna is into Sebastian.”

Alex Pettyfer will join Channing Tatum in Magic Mike, a movie based on Tatum's past experience as a male stripper.

Director Steven Soderbergh called the flick "sexy, funny and shocking," and given Pettyfer's bad boy reputation (not to mention his infamous tattoo), it sounds like the 21-year-old actor is perfect for the role.  Click after the jump to read more about the motion picture!