Josh Groban Tells Ellen About 'Brilliant and Funny' Girlfriend Kat Dennings

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Josh Groban attends the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada.

Josh Groban opened up on Ellen about his girlfriend Kat Dennings -- and explained that a few iconic comedies played a big role in why they first got together.

"She's well she's such a brilliant and funny person," he shared. "Humor is such a huge thing for me, so the fact that we could talk about Monty Python and all sorts of weird other things, I was like, 'OK, yeah, we're on the same page.'"

Elsewhere in the chat, Groban talked about performing the National Anthem at the Kentucky Derby ("very nerve-wracking"), and even managed to have a surprise freak-out moment, courtesy of Ellen DeGeneres.