JAMIE LYNN SIGLER

The couple reportedly ended its romance so that both could concentrate on their careers.

A source tells America's Life + Style magazine, "Jamie is pursuing her career in LA, while Scott is focused on his career in New York."

Sartiano is the owner of hip New York restaurant Butter and the new lounge 1 Oak.

The insider adds, "They're doing what's best for each of them."

The split is the latest heartbreak for 26-year-old Sigler, who ended her three-year marriage to A.J. Discala in 2006.

Source: WENN