The actress, 40, who stars as studio exec Dana Gordon on HBO's Entourage, was surrounded by family and friends as she married director Russ Lamoureux at SoHo House's rooftop garden in L.A. on Saturday.
"I have to say, it was a night we didn't want to end," Zimmer, 40, tells PEOPLE exclusively.
The bride wore a vintage re-creation by Karen Zambos and Nony Tochterman of Petro Zillia and diamonds by Penny Preville. The couple's 2-year-old daughter, Colette, served as the flower girl.
Guests, including friends Tiffani Thiessen and Julie Bowen, received hand-cut silhouettes as parting gifts.