Ariana Grande's First Public Appearance Since Split with Pete Davidson

Ariana Grande put on a brave face and belted out a big tune in her first public appearance since ending things with Pete Davidson.

Grande performed "The Wizard and I" Tuesday in a pre-taped TV special for the Broadway musical "Wicked." Grande assured fans Monday she'd still be a part of the event, even after the split with Davidson, and she delivered on her promise.

TMZ broke the story ... Davidson was supposed to headline a comedy gig Wednesday at Temple University but dropped out last minute. He's being replaced by Adam DeVine.

Grande has already returned the $100k engagement ring from Pete, and she'll keep their pet teacup pig, Piggy Smallz.