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Kat Dennings, Josh Groban

Frazer Harrison/Getty Images

Kat Dennings and Josh Groban are dating, E! News can exclusively confirm.

The 2 Broke Girls actress, 28, an the "Brave" singer, 33, made their first official outing as a couple at the Carousel of Hope Ball in Beverly Hills Saturday. "They were so cute together!" a source says of the stars. "They were adorable on the carpet. She was whispering in his ear a lot and they seemed really happy."

Groban performed three songs at the annual benefit.

Dennings later Instagramed a picture of herself getting cozy with her new boyfriend on the red carpet, writing, "I ship it." That same night, Groban told his Twitter followers, "Lovely night all around. Always happy to support Barbara Davis and her #CarouselOfHope ball to raise money for Diabetes research."

On Sunday, the musician echoed Dennings' caption, tweeting, "I just shipped my pants."

Prior to dating the singer, Dennings was most recently in relationship with 2 Broke Girls guest star Nick Zano. Groban, meanwhile, dated Mad Men actress January Jones and had a fling with singer Katy Perry. Thor: The Dark World star Dennings is certainly an upgrade for Groban, who joked to Chelsea Handler in April 2013 that he was dating his dog, Sweeny. "He's kind of the love of my life at the moment," he said.

Congratulations to the new couple!

—Reporting by Linda Kim and Holly Passalaqua