Brian Baumgartner is now a married man.

The 41 year-old actor walked down the aisle with his longtime girlfriend Celeste Ackelsom on Saturday (April 26th) in Los Angeles, Us Weekly reports.

Baumgartner, who is most famous for starring in NBC's 'The Office' as Malone, tied the knot in his back yard, while the reception was held at the Wilshire Country Club.

Several notable faces were in attendance, including co-stars John Krasinski, who brought wife Emily Blunt, as well as Jenna Fischer, Angela Kinsey and Oscar Nunez.

Other celebrities, such as 'Gossip Girl' actress Jessica Szohr, also witnessed the nuptials.

Fischer, who plays Pam in 'The Office', sported a very large baby bump to the ceremony as it was announced in February that she and her husband, Lee Kirk, are expecting their second child together.

But the mother-to-be arrived on Saturday on her own while wearing appropriate wedge heels, a long blue and white maxi dress accompanied with a beige clutch.

Celeste looked simply beautiful in a strapless ivory lace gown with a mermaid-esque bottom, while wearing her brunette locks down.

The groom dressed very trim for the ceremony as he wore a grey suit accompanied with a black tie.

As well as starring in the NBC sitcom, Baumgartner also had a guest appearances in Mike & Molly, Hot In Cleveland, and 2007's rom-com License to Wed, which featured co-star Krasinski.

This is his second time walking down the aisle as he was previously married to Julia Fisher with whom he has one child.

Congratulations to the happy couple!

Brian Baumgartner
Baumgartner with his co-stars, Ellie Kemper [L] and Angela Kinsey [R]