The star reportedly wore two pairs of 'Spanx' pressure pants to appear slimmer for her recent post-baby body "grand reveal" on US TV.
The new mum who has a $3 million deal with Weight Watchers "Spanxed up" for the TV appearance, according to a report by Star magazine.
The tabloid also claims 32-year-old Jess used "a lot of makeup contouring" to create the illusion of a slimmer face, and had her hair layered "to make her cheeks look less chubby".
"I set small goals for myself ... I've lost weight every week, thank God, but I've worked really, really hard. I have to shoot a new season of my show Fashion Star, so I want to be in all the pretty dresses and the designer gowns. I'm 10 pounds (4.5 kilograms) away from that, so, by the time we're shooting, I'll actually be smaller, which is exciting."