Constance Zimmer Gets Engaged

06/20/2010 at 11:00 AM EDT

Sorry Ari Gold – she's officially taken! Constance Zimmer, who plays feisty studio exec (and target of Gold's "affections") Dana Gordon on HBO's Entourage, is getting married.

The actress, 39, is set to wed boyfriend of four years, director Russ Lamoureux, her rep tells PEOPLE exclusively. They welcomed a daughter Colette Zoe in January 2008.

The couple will marry in the fall.

– Jen Garcia

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