Kate Gosselin, that's who. 

After all, who needs a husband when you've got eight kids to keep you company on your special day.

Plus it doesn't hurt having a tall, muscular bodyguard to help comfort you either!

Jon Gosselin was probably celebrating his anniversary with a gaggle of twenty-something-year-old girls. 

Whatever the case, Kate was all smiles as she bounced around the yard with her kids and dogs. 

We also spotted some eye candy in the gallery. Could that have something to do with Kate's playful attitude? 

Check out the gallery and tell us what you think!