gleestarengaged23.jpg I Am Number Four co-stars Dianna Agron and Alex Pettyfer are engaged, a source tells UsMagazine.com.

Director D.J. Caruso set them up less than a year ago, and Pettyfer recently gushed to Ellen DeGeneres, "[Dianna] is an amazing woman, and she's got this old school, classic movie-star elegance to her. I'm just very happy in my personal life."

Though reps for the young couple have yet to confirm the news, sources
on the Glee set tell E! Online, "They've been living together for several months, that's around the time I believe they got engaged."

Hmm, sounds like it might be true after all!