Back in January when Matt Damon epically commandeered 'Jimmy Kimmel Live,' a lot of people marveled over the pack of A-listers who showed up for guest appearances. But if you thought that was solely due to Damon's star power, think again -- because a whole slew of Hollywood elite were in attendance when Kimmel married fiancee Molly McNearney this weekend.

Jimmy tied the knot with his longtime girlfriend on Saturday, July 13, in Ojai, Calif., where celebrity guests included Jennifer Aniston, Ben Affleck, Jennifer Garner, Kristen Bell, Dax Shepard, Ellen DeGeneres, Portia de Rossi, Howard Stern, and -- yes -- Matt Damon.

The festivities kicked off on Friday night when Jimmy, 45, and Molly, 35, welcomed select guests for a rehearsal dinner, and will wrap today with a post-wedding brunch.

"Jimmy and Molly seemed ecstatic and so happy to see family and friends," an Us Weekly source said about the Friday night gathering. "Everyone stood around hugging and laughing over cocktails."

This is Kimmel's second marriage and McNearney's first. Mazel tov, kids!