Leigh, 50, who shot to fame in 1982's Fast Times at Ridgemont High, landed the recurring role of Emily Thorne's mother on the Hamptons-set melodrama, EW.com reports.
The role was teased in the show's May finale, when it was revealed that Emily VanCamp's character still had a very special family tie after all. (And this means the Hamptons's reigning queen Victoria Grayson, played by Madeleine Stowe, has some competition ... assuming she's still alive next season.)
"What you're going to discover about the woman who was Emily's mother is the circumstances under which they were separated, and you're going to find that there's some deep psychological issues with her, which I think is going to be fun for us to explore," show creator Mike Kelley previously told EW.com.
"For Emily," he said, "she's going to start seeing some of the psychological damage that her mother has in herself."
On Newsstands Now
- Kim's Delivery Room Drama!
- Katie: A Year After Split
- Princess Kate: Palace's Baby Plan Revealed
Pick up your copy on newsstands
Click here for instant access to the Digital Magazine