The guest of honor, 31, who runs a successful fashion empire of her own, donned a flowing blue Roberto Cavalli dress and Miu Miu shoes.
She topped off the look with Neil Lane jewels and baubles from Loree Rodkin, including $38,750 diamond and sapphire earrings, a $52,250 sapphire ring and a $16,250 white gold cuff.
Says the Fashion Star mentor of her big day: “It was perfect!”
For exclusive photos from Simpson’s shower, plus more details of her big day and new hints about her baby girl‘s name and nursery, pick up this week’s issue of PEOPLE, on stands Friday.
– Lesley Messer with reporting by Jennifer Garcia