Jason Biggs and Jenny Mollen are calling it quits after 18 years of marriage.

The pair announced the split in a joint statement ... with a rep telling us the two are still on "great terms" and are focused on raising their two kids.

A source close to the couple tells TMZ ... there is zero drama, and they're on great terms. They even recently celebrated Jason's birthday as a family.

Jason and Jenny met while shooting the movie "My Best Friend's Girl" in 2007 ... and they got engaged just a few months later.

They eloped in April 2008, then held a larger ceremony in Napa Valley, California a few months later. They share two kids together -- 12-year-old Sid and 8-year-old Lazlo.

In 2024, Jason and Jenny collaborated on a reboot of "Dinner and a Movie" -- a half-hour show on TBS where the pair would watch movies and host guests.

Jenny hosted her own podcast -- "All the Fails with Jenny Mollen" -- on which Jason was a frequent guest from March 2024 to January 2025.

We'll have to wait and see if the pair plan on splitting the marital pie 50/50.