boots Britney Spears dress tummy the basement

Britney may have started her day yesterday all primped and polished, but when she returned to the Basement dance studio later in the day, she was all business!

Spears had her hair pulled back (unfortunately), her sweats on, and was ready to get to work!

Now, all this rehearsal can mean only one thing ... a performance is coming up, right? Would she sing Hold It Against Me at the Golden Globes this weekend? Of course not ... Would she perform her new hit single at the Grammys in a few weeks? Seems a bit more than likely, huh?

We KNOW Brit will kill it with this much rehearsal under her belt before the big night. She's not taking any chances after the MTV Video Music Awards fiasco in '07. Britney will PROVE she's back with this gig ... we hope! And yeah, yeah, we know she never went away, but really. Aren't we all ready for a real comeback?