So that's why Miley Cyrus was flaunting her rock hard abs in a red "Channing" shirt at Jimmy Kimmel Live! the other day!

Miley joins Channing Tatum, Jamie Foxx, Olivia Munn and Gabourey Sidibe for the “(I Wanna) Channing All Over Your Tatum" video that was part of last night's show.

Channing tweeted the day before, “I’m in one of the strangest music videos of all time with @iamjamiefoxx @MileyCyrus @jimmykimmel & more. Premieres tonight on #JKLGameNight!”

It's hilarious ... check it out above!