Backstage at Ellen, Rob Pattinson hid his new ‘do behind a baseball cap in preparation for his big reveal today!

Robert Pattinson was in the Ellen building May 18, and all anyone could talk about was his new quasi-buzz cut!

The Twilight hunk was so relaxed backstage that he wasn’t aware of the mass hysteria he was causing by simply wearing a hat! Interns and staffers were told ahead of time not ask for photos or autographs, but lurked around hoping Rob, 24, would take off the ball cap while he filmed the segment that airs today, May 19.

“I couldn’t believe it,” a show insider confided to HollywoodLife.com exclusively. “It felt like a birth! We all felt like we were witnessing something special. If he looked any cuter he may have been arrested!”

Our source says that Rob was humble, courteous and nice, and greeted everyone around him, including host Ellen, who popped by his dressing room briefly (lucky thing). The conversation was short, but the two managed to get in a little light American Idol chatter. “Rob hasn’t been following the show closely so he didn’t know which contestants were left, but he made sure to tell Ellen to say ‘hello’ to Simon [Cowell] for him,” our source dished.

Those Brits do love to stick together — and now both Rob and Simon even have similar haircuts! Do we smell a R-Patz guest appearance on X-Factor in the making?

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