Britney Spears spent Sunday working on her tan at Forever Bella tanning salon in Westlake, CA. She went casual instead of joining all the ladies at the Grammy Awards yesterday, since she wasn't up for any awards. She did win a Grammy back in 2005 for "Toxic," though, and she may be making an appearance at the musical show again in the future. Britney's been working on new music and shared that her sons, Sean Preston and Jayden James, are the inspiration behind a new song. Britney recently tweeted, "I'm at the studio recording a new song for my boys. They are going to freak out when they hear it. So excited!"