Kaley Cuoco threw husband Ryan Sweeting a surprise birthday party on Saturday night and boy was he surprised! Kaley's sis posted this adorable video of the big moment.

The tennis star turned 27 on Sunday, and it's been almost a year since the couple first met.

Cuoco commissioned a pop-up book cake -- chocolate chocolate chip on the inside with vanilla buttercream frosting -- and lots of yummy food.

After guests chowed down, there was a bit of a swim party, and Kaley had a set of marquee lights put up around the pool that read, “Happy Birthday Ryan." There was also a photo booth, and Kaley even hired the synchronized swimming group the Aqualillies to dress up as mermaids, according to People.com.

Wow -- sounds like she really went all out!