The multi-platinum certified singer sat down with ET's Brooke Anderson on Wednesday to talk about his new project, his love of comedy, and his burgeoning relationship.
"We share a great sense of humor," Groban said of Dennings. "No one makes me laugh more than she does."
"I'm very lucky my girlfriend has joined me tonight," Groban told ET back in October. "It's her first time hearing me sing. So I'm going to do some extra warmups tonight so I don't suck."
Talking with Brooke, Groban also opened up about that sense of humor that attracted his lovely girlfriend to him in the first place.
The singer doesn't shy away from showing his comedic side. Groban has even appeared on Jimmy Kimmel Live! to sing Kanye West's tweets in one of the funniest segments ever.
"I am on Twitter exclusively for [Kanye's] Twitter rants," Groban joked, adding. "Anytime Kimmel or somebody gives me the opportunity to kind of have a laugh and have fun and not to take it so seriously… I always have a great time doing it."