Britney Spears appears to have forgotten making her last video "Piece Of Me," after leaving the staff at Hollywood club Social baffled with questions about the venue where she filmed the promo.

The troubled pop star took over Social for a day to shoot the video in November - and spent 10 hours there, dancing and lip syncing.

But, when Spears returned to Social for a night out on Saturday, it appeared she had no recollection of shooting the video.

A source tells Hollyscoop.com that Spears chatted with the bemused general manager of the restaurant, asking, "How long have you been open?" and what was upstairs, where she filmed the "Piece Of Me" video.

-Britney Spears Pictures

(This news article provided by World Entertainment News Network)