Brian Baumgartner -- a.k.a. Kevin Malone -- tied the knot in his backyard Saturday in LA ... and was joined by former co-stars Jenna Fischer, Angela Kinsey, John Krasinksi and Oscar Nunez.
It doesn't look like Steve Carrell made a cameo appearance at this wedding ... but it's obviously cause he and Holly are busy taking care of the kids.
#RIPTheOffice
