Britney Spears took a trip to her dance studio in Hollywood last night to work on her exercise routine and dance moves. As Brit gave us more news about her Circus album's tracklist, Simon Cowell revealed that Britney's X Factor appearance is soon, Nov. 15, and she'll be singing "Womanizer." Simon praised Brit saying, "She has come back from a very dark place and is a terrific artist." Britney seems ready for action this time and is set to hit the stage at least twice so far to promote her album. In her downtime, she's still sharing bits and pieces of her personal life including some sweet photos of trick or treating with the boys.