robpattzundies.JPG Photo Credit: Michael Rozman/Warner Bros.

And not just any underwear -- a special shipment of custom Ellen briefs!

Robert Pattinson appeared on The Ellen DeGeneres Show this morning, and the sexy British star chatted with the host about how some underwear she recently sent him made a surprise cameo in Twilight.

"I was doing the last Twilight movie and I only had one pair left and they were those ones [the "Ellen" underwear]," Rob said. "We were doing this big fight screen and for some reason I think the shape of my body, my back is too long or something. So my *ss is constantly hanging out ... Every single shot we were doing this big fight and every shot has these Ellen underpants. It came to a point where producers are calling up my agent going, I don't know what he is up to but I don't like it."