Though Simpson is clearly proud of her body now, it wasn't always that way. In an interview with Women's Health last year, the fashion designer revealed that she's her own biggest critic.
"I'm hard on myself, I believe everything is a work in progress. But that's okay. I do love my legs, but my favorite physical attribute is my nose, because it's not perfect," she said.
"But recently, since I've worked out so hard, I'm also loving my stomach -- knowing I grew babies in it, and then having to go through a transformation and just owning it," she added, noting that seeing her body criticized on magazines "sucked."
"I can't sit here and say I don't notice it. I will never understand why people take someone down for what you look like," she shared. "If I had a character flaw, take me down. But a body flaw? That's not important."