Britney Spears' Casual Errand Run

Later that day, the 31-year-old pop princess announced to fans on Twitter some exciting news on the music front.

Seemingly referring to her two sons, Brit shared, "I'm at the studio recording a new song for my boys. They are going to freak out when they hear it. So excited!" followed by, "It's a surprise so keep it shhhhh and don't be grouchy. I'll fill you all in soon ;)."