Kate Gosselin showed off her washboard abs while jogging in a sports bra last Friday.
Could the mom of eight — who got a free tummy tuck after welcoming her sextuplets — have simulated a six-pack with an airbrush tan? After all, she loves to fake bake so much, she even spent her sextuplets' fifth birthday — which was also Mother's Day — at her fave local tanning salon.
"When I look at Kate's pics from the previous year and then compare them to these, you can see she is taking advantage of a good tan to make her abs and arms look much more defined! Why waste that hard work at the gym without emphasizing it with a tan?" Dera Enochson, the owner/founder of Xen-Tan sunless tanning products (the Olsen twins, Samantha Harris and Kara DioGuardi are fans) tells UsMagazine.com.
"It doesn't look like she's had her stomach specialty airbrushed to draw in ab-muscle definition, but a spray tan will make your abs look 10 times better," adds Enochson. (Just ask Mariah Carey, who sported a little sunless contouring before performing in Macy's 2009 Fourth of July parade.)
Mystic Tan founder Ricky Croft tells Us, "While there was no airbrush used to outline her abs, a sunless tanner is definitely being used to help accentuate them further."
So how did Gosselin, 35, get that kind of definition?
"She has to be doing a lot of deep core training: planks, really working on activating her glutes," says NYC-based Crunch personal trainer Jenn Burke. "When you have children, it causes an anterior pelvic tilt, which causes the stomach to look more puffy than it is. You have to align it and activate those muscles again."
Burke says Gosselin is likely maintaining her Dancing With the Stars physique by working out "an hour five or six times a week with circuit training moves full of high reps to keep the body constantly moving and shedding fat and defining the look."
Gosselin's diet is "70 to 80 percent" of keeping her toned tummy. "She'd need to eat lots of high-quality protein like chicken and fish and fruits, vegetables and high-fiber grains. Right around 1400 to 1600 calories a day."
L.A.-based trainer Whitney M. Cole says Gosselin's tummy tuck, "merely removed the loose skin that stretched beyond repair during her six-baby pregnancy. The muscles are her own work… they're moving with her stride and breathing versus staying stationary on her skin, as a paint job would!"
Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!