On Tuesday, the 25-year-old actress/aspiring musician put on one heck of a show at The Sayers Club in Los Angeles, California.
Wearing a vintage-looking long white gown, the brunette beauty took the stage where she showed off her soulful singing chops.
Check out the video above to see Willis belt Marvin Gaye's "Let's Get It On"!
Before taking on the classic tune, Rumer opened with Lorde's "Royals" and sang The Beatles' "Come Together."
Demi Moore was on hand to support her daughter and the place was packed. Judging by this video, Willis definitely didn't disappoint.
Back in July, Rumer performed at the Music at the Lot Party in Los Angeles, where her famous mom, once again, cheered her on from the audience.
In addition to working on her singing career, Rumer will be back on the big screen soon enough. The daughter of Demi and Bruce Willis currently has four films in production, and recently finished work on the drama "The Odd Way Home."
How do you think Rumer sounds? Tell toofab in the comment section below!