The star personal trainer who made it big on “The Biggest Loser” is about to lose her insane Malibu mansion.

Just like the hundreds of pounds she helped the brutal reality show’s contestants drop, Jillian Michaels is shedding her glorious oceanfront home.

The three-bedroom, four-bath spread, on the Pacific Coast Highway in Las Flores Beach hit the market for $9.75 million this week, according to Zillow.

The contemporary home spans 3,157 square feet and boasts enormous beach-facing windows, high ceilings, spa-like bathrooms and luxurious outdoor space with cushy chairs and outdoor fire pits. All that, plus ridiculous 180-degree views of the Pacific.

It’s been renovated, a process documented on Michaels’ new reality show on E!, “Just Jillian,” whose first season wrapped up in March. (On the show, which follows the life of her family and is partly set at the now-for-sale Malibu home, Michaels balked at spending $41,000 on a lounge chair.)

Michaels won’t be homeless — far from it. She, her fiancee Heidi Rhoades and their two children will presumably decamp to a nearby estate with horses and pastures she purchased for $3.61 million two years ago.

She picked up the beach house in 2010 for $6.62 million, so it stands to make a pretty penny if a sale closes for near the asking price.

Michaels is reportedly worth at least a few million dollars, so this will only pad her coffers.

Bruce Mibach of Coldwell Banker has the listing.