'Twilight' stars: then and now

Kellan Lutz

Kellan Lutz (Emmett Cullen)

Then: Lutz may be playing the Cullens' buffed up enforcer, Emmett, but the 23-year-old actor appeared in the critically acclaimed HBO war drama "Generation Kill" and has had roles on other high-profile series including Lisa Kudrow's HBO comedy "The Comeback," "Heroes" and "CSI."

Now: You most recently saw Lutz as jerky jock George on "90210."