Shannen Doherty‘s ex-husband, Ashley Hamilton, is recovering in a hospital after suffering an apparent overdose … TMZ has learned.

Sources with direct knowledge tell us the “Iron Man 3” actor was found last Thursday in an L.A.-area Airbnb, and was experiencing a medical emergency related to an unknown substance. We’re told he was rushed to the hospital where he remains in stable condition.

Hamilton, who has appeared in a number of films over the years, famously married Doherty in 1993 after just 2 weeks of dating — he was 19 at the time — but the marriage lasted only five months before ending in divorce.

Beyond his acting career, 51-year-old Ashley comes from a well-known Hollywood family. He is the son of actor George Hamilton and Alana Stewart, and was once the stepson of rock icon Rod Stewart. He and his siblings — including Kimberly Stewart and Sean Stewart — starred in the short-lived 2015 reality show “Stewarts & Hamiltons.”

Ashley has publicly battled addiction in the past — reportedly going to rehab more than 30 times — and has even become a sober companion to others coping with substance abuse.