There were A-list celebs everywhere and a private Taylor Swift performance!

America's sweetheart, the one-and-only Reese Witherspoon celebrated her 40th this weekend.

Reese Witherspoon / Via SnapChat

As you might expect, the party was literally full of celebrities.

Instagram: @erinfoster

Here's Taylor Switft posing with Cheryl Strayed and Laura Dern:

Instagram: @cherylstrayed / Via Twitter: @TSwiftDailyNews

Oh, but not only did Taylor attend, she also performed!

Kate Hudson / Via SnapChat

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