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Jessica Simpson's little boy is growing up fast! On Thursday, Jessica shared sweet family photos [2] from her son Ace's third birthday party — which had a fun dinosaur theme — and didn't hold back her emotions; on a snap of herself with husband Eric Johnson, Ace, and 4-year-old daughter Maxwell, she wrote, "Happy Birthday dinosaur! You complete me," while another photo of Ace with his big sister and giant birthday cake was captioned, "Ace turns 3 and I feel prehistoric! #dinoparty #aceknute." We're going to have to firmly disagree with the singer and fashion mogul, who is (only!) turning 36 in July — and looks hotter than ever [3]!

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