The star, 39, will exchange vows with her beau of three years this autumn (10), her rep has confirmed to People.com.
Zimmer and Lamoureux are parents to a two-year-old daughter, named Colette Zoe.
Which Oscar-nominated actor went to school with the Duke of Cambridge?
As if! Clueless turns 20-years-old this July.
We loved Leah Remini as Stacy Carosi. Next Jimmy Fallon reunion, maybe?
Which actor has been working on the same television network since 2002?