PHOTOS: Jessica Simpson Flaunts Baby Maxwell at Fiancé's Birthday Party

She shares two adorable new photos of her four-month-old

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It may have been Eric Johnson’s 33-birthday party on Saturday, but the attention wasn't on Jessica Simpson’s fiancé, but her adorable daughter.

Birthday guests were cooing over the four-month-old, while her doting mother, 32, shared a couple of cute photos via Twitter, including her official website.

“Last year at Daddy’s party, Maxwell was in my belly. This year she’s in my arms!” the Fashion Star mentor wrote, accompanied with a couple of individual photos of the doting new parents, during the birthday festivities in the backyard of her home in Beverly Hills. 

The retired NFL player – and Massachusetts native, who was wearing a Red Sox baseball cap – held his baby girl, looking down admiring his first-born as Johnson celebrated his first birthday as a new father.

Simpson made her highly anticipated post-baby body debut on Katie Couric’s new talk show, Katie, on Sept. 10, revealing she’s lost 40 pounds since giving birth to Maxwell in May.

The spokeswoman for Weight Watchers told Couric, “My doctors told me [my baby weight] was a lot of water, and when my water broke. … All the weight did not come out with the baby. I had to stay focused on my diet. I want to be as healthy as I can because I’m a mom now.”

Simpson also revealed she has 10 pounds to lose to be back at her pre-baby weight.

PHOTOS: Jessica Simpson sheds the baby weight ahead of NYC appearances

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Jessica Simpson steps out with her new family (Splash News) September 2012