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Katherine LaNasa, Grant Show

DDP Images/Sipa USA

Well, that was quick!

The Campaign actress Katherine LaNasa and fiancé of just a month actor Grant Show said "I do" Saturday in a rustic California ceremony a rep for the newlyweds confirms to E! News.

The couple made it official in front of family and friends in Topanga, Calif., at The Oak Grove at Ribbit Tree & Plant Nursery. LaNasa stunned in a Naeem Khan gown and Prada shoes.

Her now-hubby and former Melrose Place star looked just as dapper in custom suit by Di Stefano Italian Fashion Group and offered his bride a Solange Azagury-Partridge ring.

We wonder if LaNasa's fellow newlywed costar Zach Galifianakis was in attendance?!