Jessica Simpson and Jay Leno
Paul Drinkwater/NBC/NBCU Photo Bank
took her maternity wardrobe
to new heights Monday night – with her footwear.
"We're waddling at this point," the expectant star
, 31, told Jay Leno on Monday's Tonight Show
. "I'm wearing six-inch heels today, and it's a lot of weight to carry on six inches."
Although Simpson, who recently went behind her dad's back to bare all for ELLE
, says she's not quite ready to give birth to her baby girl
, she's already preparing for the worst.
"Labor is really going to hurt," says the mother-to-be, whose new show Fashion Star
premieres Tuesday (9:30 p.m. ET) on NBC. "I have so much respect for my mom and all the women across the world."
Until then, Simpson – who announced last Halloween
that she and fiancé
Eric Johnson are to be parents – says her pregnancy craving of the moment is "slutty" – "slutty brownies," that is.
The three-tier treat features a layer of cookie dough and a layer of Oreo cookie.
"I don't know," she says of its unconventional name. "I guess a lot goes into them."