DJ Samantha Ronson performed a sexy lap dance for girlfriend Lindsay Lohan between her set at London’s exclusive Chinawhite Nightclub last Wednesday night.

Samantha sprang into the impromptu erotic dance to Katy Perry’s hit single “I Kissed a Girl” after becoming jealous of other girls flirting with Lindsay.

“They went into a full kiss, their hands all over each other. Nobody knew where to look,” an tattle dished to London’s The Sun.