Rob Pattinson is on today's Ellen DeGeneres Show, and the sexy Twilight star set the audience into swoon mode when he walked onto the stage.

Naturally, the first thing Ellen commented on was Rob's new haircut, and the 24-year-old actor joked that he chopped it off due to a "terrible infestation" of lice! Of course, it's actually for a movie -- Rob starts shooting Water for Elephants with Reese Witherspoon this Thursday, and he chatted with a very enthusiastic Ellen about the new flick.

Check out the video above to see the rest of Rob's interview ... he may not have Edward's dreamy 'do anymore, but this is a major treat for all of the Robsessed ones out there!