The accidental fashion mogul returns to television as a style mentor on NBC's new reality-competition show, Fashion Star, where she joins Nicole Richie, Elle MacPherson and designer John Varvatos. "I couldn't turn it down because I felt like it was great for my collection," the mom-to-be says, "but it was also important for me to talk to these up-and-coming designers and mentor them … and really try and lead them in the right direction."
Simpson and fiancé Eric Johnson welcome daughter Maxwell Drew Johnson. "Life has completely changed," Simpson, 31, tells PEOPLE of motherhood. "From how I sleep to what I think about, Maxwell has definitely taken over everything!"
Four months after daughter Maxwell's arrival, Simpson debuts her post-baby body during an appearance on Katie Couric's new talk show, Katie. "I want to be as healthy as I can because I'm a mom now," the Weight Watchers spokesperson – who has lost more than 40 lbs. since delivering – says. "It's not a diet. It's a lifestyle."
Nearly eight months after welcoming daughter Maxwell, Simpson confirms she is expecting her second child on Christmas, posting a photo of her daughter with the words "Big Sis" written in the sand. The star later flaunts her burgeoning belly on a Hawaiian vacation, Tweeting a bikini-clad photo and writing simply, "Bumpin' and Proud!"
During an appearance on Jimmy Kimmel Live, Simpson accidentally reveals she's expecting a boy. "The crazy thing is, I never knew that a wiener could actually make me nauseous," she says, before realizing her slip. "Well, I guess I just told the world that I'm having a boy! ... That was not planned. I just did it so crude, too."
A year after the birth of daughter Maxwell, Simpson and fiancé Johnson welcome their second child, son Ace Knute. "I'm so excited to have a son," the star said at the time of her baby shower. "I didn't grow up with a brother and I think the unknown is really exciting. I can't wait to have that connection with our little man."
BIOGRAPHY (top to bottom): Bauer-Griffin; Tyler Golden/NBC; Courtesy of Jessica Simpson; Paul Drinkwater/NBC; FameFlynet