LEAH REMINI has been dancing her butt off practicing for her role on "Dancing with the Stars" — or at least she's trying to!

The "King of Queens" cutie had hoped the hours of hoofing it around the dance floor with partner TONY DOVOLANI would help shrink her saggy bottom. But judging by recent photos of the 43-year-old, her plan to perk up her posterior doesn't seem to be working.

It's not the first time Leah has struggled with the pounds. After giving birth to daughter Sofia in 2004, she lost 80 pounds of baby weight by following the "1st Personal Diet."

But insiders say she's been bingeing to deal with the stress she's facing after leaving and publicly denouncing the Church of Scientology in July, incurring the wrath of her former BFF and longtime Scientologist KIRSTIE ALLEY.

Now, Leah is determined to beat Kirstie's second-place finish on "DWTS" Season 12 — and the pressure is taking its toll on her caboose.

Firing another shot at Scientology, Leah recently said: "The church is looking for me to fail so they can say to their parishioners, 'You see what happens when you leave the church?'"