By: Ivy Jacobson for TheKnot.com We love any occasion for a Dunder Mifflin reunion – especially a wedding! Brian Baumgartner, who played the lovable Kevin Malone in The officemarried his girlfriend Celeste Ackelson in his backyard on Saturday. More from The Knot: 21 Epic Groom Cakes Office Former players John Krasinski, Jenna Fischer, Oscar Nunez […]