Britney Spears blonde Starbucks

She's not messing around!

Britney Spears appeared like she's been burning the midnight oil yesterday as she was leaving a recording studio in Thousand Oaks.

The 32-year-old entertainer looked as if she's clearly gearing up for her upcoming Las Vegas residency with some fine tuning, not to mention going against rumors saying that she lip-syncs.

"I'm definitely going to be singing live," Spears said during a call-in interview on Chicago's 103.5 KISS FM. "I always sing live. It doesn't sound so great all the time, but I do my best."

We know she's gonna bring it!