Britney Spears may be one of the world's biggest and hottest pop stars, but the singer is also a great mom, too. When Brit filmed her Twister Dance promo commercial last week, in a $20,000 bra, no less, she turned her performance up a notch because her young sons Sean Preston and Jayden James were on set and watching their hot mama do her thing. Aw!

Ray Kay, the spot's director, told Us Weekly that Brit's fiancé Jason Trawick was on set with her boys. "It was really great to see how her performance was stellar when the boys were watching the monitor. It's like she turned up the performance one notch more," Kay said.

Brit may have millions of fans, but the only three that matter are the men in her life.

Kay also said that the shoot went smoothly, commending Brit Brit on her professionalism. "Britney always delivers and we had a good time on set," he admitted.

Perhaps Simon Cowell will be saying the same thing in the fall, if negotiations for Brit to take a role on 'X Factor' come to fruition and don't fall apart.