Britney: "My Sister's Not Pregnant" Huh?!?

12/19/2007 10:12 AM PST

Britney: "My Sister's Not Pregnant" Huh?!?

Britney is in some serious denial!

TMZ was with the popwreck tonight while she did some late night shopping at the Lisa Kline store on Robertson Blvd. As she left the store, she told the waiting throng of paparazzi and fans, "My sister's not pregnant!" Ding dang, wha?!

We overheard Brit Brit make the confusing statement as she left the private shopping session at the boutique around 9:00 PM last night.

Next time she hits up a gas station, someone might want to hand her this week's OK! mag. That's your sister on the cover, Brit.