Taylor Swift seen partying sans Tom Hiddleston

Taylor Swift rocked out over the weekend at a birthday party for bestie Karlie Kloss in the Hamptons. The singer joined rapper Nelly on stage at the soiree, singing Kelly Rowland's part to his hit song, Dilemma

Taylor Swift rocked out over the weekend at a birthday party for bestie Karlie Kloss in the Hamptons. The singer joined rapper Nelly on stage at the soiree, singing Kelly Rowland's part to his hit song, Dilemma.

Taylor Swift

An eyewitness tells a website that she was having fun at the party when Nelly asked her to join him on stage. "She hesitated at first but decided to do it eventually," the source says.

In a black off-the-shoulder crop top and matching skirt, Swift danced to the popular number, and was captured on Snapchat giving a male partygoer, identified as oil heir Mike Hess, a peck on the cheek. She then turned around and danced very close to him.

The singer's new beau, Tom Hiddleston, was not at the bash, the source confirms.

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