Busy Philipps turns 40th birthday into 'a destination wedding (to myself)'

See photos from her big bash.

“I decided I wanted to throw myself a destination wedding (to myself) for my 40th at one of my favorite places in the world,” Philipps wrote on Instagram.

She added, “This was, without question, one of the greatest, most fun, and beautiful nights of my life. Thank you thank you thank you to all of my friends and family who made this weekend the best of all time.”

Among the celebrity guests who jetted to Cabo for the affair were Elizabeth Banks, Colin Hanks, and "Girls" writer Jenni Konner.

There was food, drinking, dancing and even a surprise flash mob of Philipps lookalikes, all dressed in her signature "Mr. Nightgown" and pink-haired wigs.

“I’m obsessed with flash mobs!” she said in her Instagram Story, calling it the “best surprise of all time!”

Philipps’ actual birthday is Tuesday, June 25.