08/25/2011 at 09:00 AM EDT
After 10 years together, Sara Gilbert and Allison Adler have ended their relationship, PEOPLE has learned exclusively.
co-host and actress, 36, and Adler, 44, will share custody of their two children, son Levi, 6½, and daughter
Gilbert and Adler, a television producer and writer, began dating in 2001.
A rep for Gilbert confirms the breakup. "It's completely amicable," the rep tells PEOPLE.