Yesterday photogs snapped Britney Spears' Mercedes G-Wagen being towed off of her Calabasas property, and we're hearing that the pop princess is trading it in for something a little sportier! Britney was test-driving the Porsche we caught her in last week, and it looks like the hot mama wants another convertible!

Hey, she definitely deserves it - she's been working her butt off this year, so we think she should reward herself!