Taylor Swift is one of the hardest working (and best behaved) starlets in showbiz, so we think she's allowed a little down time every now and then!

The starlet tweeted this shot yesterday and wrote, “The most magical night at @DiannaAgron's circus themed birthday party!” Looks like Ms. Swift went as a tiger to the Glee starlet's 26th b-day celebration, and this isn't the first time the ladies have played dress up this month!

Last week Taylor, Dianna and several other gal pals rocked vintage frocks and went out in celebration of Shirley MacLaine's birthday, and the country cutie also posted shots with bestie Selena Gomez after the two had a low-key lady date baking cupcakes. Geez, when does she even have time to make music these days?