Julia Roberts, Jimmy Fallon pelt each other with inflatable balls

Julia Roberts visits "The Tonight Show Starring Jimmy Fallon" on July 31, 2014, in New York.

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Julia Roberts may have needed an ice pack after her recent appearance on the "The Tonight Show Starring Jimmy Fallon."

The Oscar-winning actress played a new game with the late-night host, aptly called "Face Balls," in which Fallon and Roberts pelted giant inflatable balls at each other at point blank range.

"This is like the comedy version of '50 Shades of Grey,'" the 46-year-old actress observed during the segment.

The purpose of the game was to play footage of the impacts back in slow motion for comical effect.

"I feel bad doing it, you're America's Sweetheart, I love you," Fallon said when it was his turn.

There may have been some guilt, but that didn't stop Fallon from pelting Roberts square in the face. At one point, the audience gasped when Roberts was struck, as seen in the below video:

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    Ken Lombardi is an entertainment reporter for CBS News. He has interviewed over 300 celebrities, including Clint Eastwood, Oprah Winfrey and Tom Hanks.