Taylor Swift spent last night in the Hamptons celebrating the birthday of young oil heir Mike Hess. Nelly was there too, apparently as the night’s performer, and the two stars came together to deliver an impromptu performance of Nelly’s 2002 classic “Dilemma,” with Taylor subbing in for Kelly Rowland. (An “insider” told E! that “at first she didn’t want to perform but then Nelly asked her.”) Karlie Kloss and Heidi Klum were on hand as well, and this crew has known Hess other for a while:

I may look asleep on my feet but was actually having tons of fun last night at the #nyknicks game with @karliekloss @mikeyhess @taylorswift

A photo posted by Heidi Klum (@heidiklum) on Oct 30, 2014 at 6:30am PDT

It’s good to be an oil heir! Watch footage from the performance below.

Taylor performing with Nelly in the Hamptons last night! (8.6.16) #taylorswift #nelly

A video posted by 👸🏼🎤 (@taylorxupdates) on Aug 7, 2016 at 8:39am PDT

Taylor Swift compareceu à festa do Nelly em Hamptons, NY (06/08). Confiram: https://t.co/UUjCmOZHR5 pic.twitter.com/wifRO5fsH3

— SwiftWorld.com.br (@SwiftWorld_BR) August 7, 2016

Taylor performing with Nelly in the Hamptons last night! (8.6.16) #taylorswift #nelly

A video posted by 👸🏼🎤 (@taylorxupdates) on Aug 7, 2016 at 8:41am PDT

Taylor performing with Nelly in the Hamptons last night! (8.6.16) #taylorswift #nelly

A video posted by 👸🏼🎤 (@taylorxupdates) on Aug 7, 2016 at 8:43am PDT