Sometime next year, the Anna Faris flick "I Know What Boys Like" will not only introduce the funnylady's newest chiropractor, but it will also mark the Hollywood debuts of two red-hot musicians: Katharine McPhee and Tyson Ritter. When we recently visited the set of the Playboy bunny comedy, we watched the duo compare notes about on-stage versus on-camera performances.

"This is very different," explained McPhee, looking around a set that included Faris, Colin Hanks, Emma Stone and Rumer Willis. "I can see how people would get freaked out on sets, because there's so many people behind the camera and you get only a few chances - depending on who the director is - to do what you have to do."

"I think the most common misconception is that it's harder to go in front of thousands of people, than in front of five people," said Ritter, remembering some of the huge crowds he's played to alongside his band, The All-American Rejects. "I think it's more unnerving when you've only got 5 people who are watching you!" Read more...