This is what willpower looks like: When Tori Spelling showed up at her mom Candy’s house for an elaborately catered dinner party, she toted along her own low-cal, portion-controlled meal.

(Okay, she did try some of the chef’s offerings: “just vegetables,” says a source.)

The 5-foot-6 Spelling, who gained 40 pounds during pregnancy, “is on track,” says a spokesman for NutriSystem, the diet food company Spelling is endorsing as she sheds her baby weight.

Tori has already lost 22 pounds and has reached the halfway mark to her pre-pregnancy weight. It has not been effortless. “She had a tough time at first,” says a friend. “She likes her treats.” Who does not, right? But these days, a splurge is a NutriSystem peanut butter granola bar.

Tori Spelling’s workout To tone up and to supplement her diet, Spelling works out three times a week with her personal trainer Sam Levine, who puts her through a tough mix of cardio, yoga and kickboxing.

“We do a lot of kickboxing, work on the abs, squats and lunges,” she says. Her motivation? Skinny-style jeans! But she says, “I’m happy with the way I look. I don’t think about getting down to size 0 or a size 2 because that was before. I’m a mom now!”

A pretty hot mom, if you ask me. She wants to lose another 10 pounds, but still, for all her effort, Spelling appears less impressed by the idea of a flat stomach than by her son’s every gurgle and smile. [sources: via, via]