
Guitarists from the band's support act, Testament, helped fill in for Ian during the show.
He tweeted, "It's happening fo sho."
The musician was detained by police on Saturday following an alleged argument with his girlfriend.
"I think it would surprise you how good it would sound, me and Cee Lo together," Shelton says.
The show will be Rihanna's first TV project.
Check out a clip from Joe's appearance!
Mix Up with Khloe Kardashian Odom is hitting the airwaves in Dallas next week.