To celebrate Dianna Agron's 26th birthday, Taylor Swift got frisky in a sexy skin-bearing tiger costume.

Swift, 22, posed for two pics in the costume with Agron at the April 28 circus-themed birthday bash.

Taylor

Taylor Swift Tiger Costume (Twitter/@TaylorSwift13)

The country superstar even went as far as to rock a little pace paint and collar, as she got playful with the girls.

While Swift sported the tiger costume, Agron dressed as a convincing trapeze artist, decked out in a blonde wig and some feathers headgear.

Agron, who stars on Glee, and Swift clowned around with friends at the party, posing for the pics, which the singer posted on her Twitter page.

Taylor

Taylor Swift Tiger Costume (Twitter/@TaylorSwift13)

The most magical night at @DiannaAgron's circus themed birthday party! Taylor tweeted to her 13 million followers.

Swift and Agron seem to be making a habit out of dressing up in costumes, as they have reportedly done it before.

According to Us Magazine, the two young Hollywood stars got together last week to honor Oscar-winning actress Shirley MacLaine's 78th birthday.

The magazine reports that they didn't actually hang out with MacLaine, but they did dress up in vintage formal wear for a lavish dinner party.