The Office alum Brian Baumgartner married his girlfriend Celeste Ackelson on Saturday, April 26, a source confirms exclusively to Us Weekly -- get the wedding details Credit: Ethan Miller/Getty Images

Kevin is hitched! Brian Baumgartner tied the knot with his girlfriend Celeste Ackelson on Saturday, April 26, his rep confirms exclusively to Us Weekly.

The newlyweds said "I do" at 5 p.m. PST in the actor's backyard, while the reception was held at a different location. His former Office costar Jenna Fischer and Gossip Girl alum Jessica Szohr were in attendance for the special occasion. 

Baumgartner, 41, is best-known for playing Kevin Malone on the comedy The Office from 2005 until its series finale in 2013. He's also appeared in Mike & Molly, Hot in Cleveland, and the film License to Wed.

This is the second marriage for the star. He was previously married to Julia Fisher, with whom he has one child.