We might have caught Britney Spears smiling and laughing with her trainer in the gym last night - but when it comes to her career, she's all business!

Check out the look of determination we spotted on the pop princess' face last night, both at the gym and, shortly afterwards, at a recording studio in Burbank. Way to go, Brit - with drive like that, nothing's gonna stop you from mounting the biggest comeback ever!

(Our photographers tell us that Britney had some company throughout her intensive evening - her mother! The guys spotted Britney and Lynne together several times at both the gym and the studio. How sweet of Brit to keep her mother company during such a harsh day!)

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