The Late Late Show with James Corden"The Late Late Show" recently: a riff-off.

The pop star burst out onstage on Wednesday when Corden started waxing poetic about how today's divas don't compare to those of the past. Lovato took issue with his argument and wanted to prove otherwise. Naturally, she had the a cappella group Level in tow (as one does), so she challenged him to a riff-off.

Once we got past the trash talk portion of the battle, they got down to singing. Lovato used tunes from Adele, Katy Perry, and herself to make her point, and Corden countered with work from Tina Turner and Aretha Franklin. Unfortunately for the late-night host, he doesn't have the range necessary to pull off the songs of divas then, so he was forced to bow to Lovato. They did end on a positive -- and cute -- note, though.

"The Late Late Show with James Corden" airs weeknights at 12:37 p.m. ET/PT.