Kirstie Alley is finally making the leap from “Fat Actress” to reality star.

A&E will debut Alley’s new series, “Kirstie Alley’s Big Life,” March 21 at 10 p.m.

The long-rumored half-hour series follows the Emmy-winning actress as she struggles with her weight. Alley is using the show as a platform to help launch her new weight-loss company.

She originally lost 75 pounds as a spokesperson for Jenny Craig, but parted ways with them in 2008 and has since gained a lot of the weight back.

“Big Life” will also focus on Alley raising her two teenage kids — True, 17, and Lillie, 15 — as a single mom in Hollywood.