hollywood Derek Hough dwts dancing with the stars

Derek Hough left TRU in LA solo after a hot and heavy makeout session with new ladylove Lauren Conrad.

The twosome were very affectionate while on the dance floor, according to People. An onlooker tells the mag,

    "It was obvious there was a lot of chemistry between the two. She was very smitten."

The onlooker adds, "Neither seemed embarrassed about kissing in public."

So sexy!