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Taylor Swift Snapchat

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Taylor Swift 's Saturday night was one to be remembered! 

Partygoers at a birthday celebration in the Hamptons over the weekend were treated to quite the treat when Taylor Swift and Nelly came together to perform the rapper's 2002 classic, "Dilemma." In multiple videos shared online, the Grammy winner can be seen having an absolute blast onstage with her newfound duet partner as she takes on Kelly Rowland's part in the song.

Things took a turn for the innocently flirty when Swift was joined by Mike Hess onstage, a Harvard Business School graduate and oil heir that a partygoer confirms to E! News was the birthday boy that evening. 

In a Snapchat video shared by jewelry designer Jen Meyer, the "Shake It Off" songstress can be seen strutting her stuff towards Hess before laying a quick smooch on his cheek. The duo then dances closely together, as Hess slightly wraps his arm around her waist. 

The insider tells us exclusively that although her boyfriend Tom Hiddelston was not present, "Taylor was in an amazing mood, and super fun all night. She danced her ass off. At first she didn't want to perform but then Nelly asked her. Everyone was super into it, the crowd loved it."

As for Swift's onstage moment with Hess, the source says they didn't hang out too much except for a little dancing. As it turns out, Swift spent most of her night with close pal Karlie Kloss, the source adds, who recently celebrated her 24th birthday earlier this week. 

Heidi Klum was also spotted at the star-studded party, and Hamilton star Leslie Odom Jr. performed as well. 

Taylor and Hess appear to have known each other for awhile now, as a 2014 snapshot from Klum's Instagram page shows the pair cozying up to the supermodel and Kloss.