While Nicole Richie is busy caring for ever-expanding baby bump, the mother and girlfriend indulged herself in a little personal obsession--her big Friday night out to catch the Britney Spears concert.

Richie Twittered up a storm yesterday, letting fans and followers know just how thrilled she was to attend.

"I'm a SLAAAAVVVEEE for Britney. Im counting the minutes," Richies' tweet read.

She also jokingly said she would be donning her "favorite" outfit of Britney's to the show, the large shearling coat Spears wore (with nothing else) for her pregnancy spread in Harper's Bazaar.

Thankfully, the concert was one night only, or Joel Madden might have a problem on his hands.

"Joel better be prepared for me not to come home. I might join the Circus!" she twittered from the actual show at LA's Staples Center.

(Photo: Fame)

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