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Taylor Swift

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Last week, besties Taylor Swift and Dianna Agron got together with a few of their girlfriends and had a little celebration in honor of Shirley MacLaine's 78th birthday.

But this weekend, the adorable blondies traded in their pastel dresses for circus wear and threw a party in Ms. Agron's honor.

So, what's the special occasion for the silly costumes? Or did Dianna and Taylor simply have the urge to get their Ringling brothers on?

They were celebrating another birthday!

This time, it was for Dianna Agron's 26th B-day—the Glee star turns another year older on April 30.

The 22-year-old Swift donned a sexy tiger-inspired costume for the event, while Agron rocked a trapeze artist get-up. Taylor tweeted a photo from the bash and wrote, "The most magical night at @DiannaAgron's circus themed birthday party!"

The blonde BFFs have been spending a lot of time together as of late—keeping us constanty updated with their outings via Instagram.

We just love this sweet set of besties and can't wait for the next adorable set of pics!

Now, let's get a duet with these two in the works! Can you imagine how terrific those tunes would be?