Lauren Conrad and Derek Hough share a kiss on the dance floor

A source told People that Conrad and Hough were joined by Lo Bosworth and Hough’s Dancing With The Stars co-star Mark Ballas in the club’s back room.

Hough was said to have his arm around Conrad’s waist as they partied together on the dance floor.

An onlooker tells People, “It was obvious there was a lot of chemistry between the two. She was very smitten.”

Derek was previously linked to British singer Cheryl Cole, while Lauren split from long time boyfriend Kyle Howard in June.

This isn’t the first time the two spark rumors of a romance after being spotted together.