HAIM have spent the last few months as the openers on Taylor Swift’s massive 1989 stadium tour, and their last show on the tour was last night at the Scottrade Center in St. Louis. Lately, Swift has been bringing surprise pop-star guests out to duet with her every night; she had Mick Jagger singing “Satisfaction with her over the weekend in Nashville. Since the show as in St. Louis, it obviously made sense to bring Nelly to the stage. With Swift, he did “The Fix,” his new DJ Mustard-produced, “Sexual Healing”-sampling comeback attempt. But when that was out of the way, we got the real show: Swift bringing HAIM, in matching white mini-dresses to the stage so that the four of them could do backing vocals and a charmingly halfassed choreographed dance routine to “Hot In Herre.” Watch it all go down below.

I LOVED getting to sing The Fix & Hot in Herre with @Nelly_Mo! What a way to end @HAIMtheband's run on the 1989 Tour🔥 pic.twitter.com/xtvGrbVPeU

— Taylor Swift (@taylorswift13) September 30, 2015

"WHAT?!" @Nelly_Mo @HAIMtheband #1989TourStLouis pic.twitter.com/lZYDlJNmsS

— Taylor Swift (@taylorswift13) September 30, 2015

The highlight of our friendship thus far @HAIMtheband PS WE LOVE YOU @Nelly_Mo #1989TourStLouis pic.twitter.com/3USBBookRg

— Taylor Swift (@taylorswift13) September 30, 2015

BUSTING LOOSE bc Tay, Nelly & HAIM threw it back 2night w/ 'Hot in Herre' #1989TourStLouis pic.twitter.com/LJiJvaNegm

— Taylor Nation (@taylornation13) September 30, 2015

DOING OUR BEST CHARLIE'S ANGELS IN ALL WHITE 🙌 #hotinherre #1989TourStLouis pic.twitter.com/hnILno8DJW

— HAIM (@HAIMtheband) September 30, 2015

Seriously, though, “The Fix” is a bad song.