I love a world that will consider lip syncing in a few nightclubs a 'comeback' for Britney Spears.  As of Wednesday, Britney had appeared at two different 'House of Blues' nightclubs under the cover-name M+Ms. 

Fans and critics in both San Diego and Anaheim, where the two concerts were held, agreed that Spears was likely lip syncing.  Britney and her back-up dancers were evidently performing with dance moves she choreographed herself.  Each performance lasted between 15 and 20 minutes.

Two more concerts are expected in Los Angeles House Of Blues club and the House Of Blues in Las Vegas.