Samantha Ronson hollywood viper room smoking dj

Samantha Ronson was in a very playful mood as we caught up with her outside of The Viper Room puffing on a cigarette Thursday night.

Lindsay Lohan's ex performed with her new band, The Undertakers, and BFF Nicole Richie showed up to support the celebrity DJ-turned singing star. We wish Lilo had made an appearance!

Ronson has been laying low since her DUI arrest last week, when she was pulled over outside of Baker, Calif., at 10:31 a.m. on her way home from a gig in Las Vegas. Ronson was clocked driving 89 mph, and was immediately taken into custody after failing a field sobriety test.

Check out an impromptu Twitpic Sam posted during her sound-check at the Viper Room last night, after the jump ...