Last month, Britney Spears released a new version of “Slumber Party,” a track off of her recent album Glory, featuring spaced-out R&B singer Tinashe. And last night, the two of them performed that new version together for the first time, bringing some choreography and a whole lot of backup dancers to LA’s Staples Center for 102.7 KIIS FM’s 2016 Jingle Ball. As DirectLyrics points out, their lip-syncing wasn’t great, but hey — practice makes perfect! Watch below.

Britney and Tinashe perform "Slumber Party" HQ Video Part 1 pic.twitter.com/U52RLPwAS1

— carlo de santis (@CandidlyCarlo) December 3, 2016

Britney and Tinashe perform "Slumber Party" HQ Video Part 2 pic.twitter.com/kRdcZwn2tw

— carlo de santis (@CandidlyCarlo) December 3, 2016