Jessica Simpson celebrates daughter Maxwell’s birthday with sweet photo: ‘You are the coolest person I know’

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Jessica Simpson and husband Eric Johnson welcome daughter Birdie Mae

Jessica Simpson and husband Eric Johnson announced on social media Wednesday that the fashion designer has given birth to their new daughter Birdie Mae. The baby, weighing 10 pounds 13 ounces, is the couple's third child together. Johnson and Simpson are also parents to 6-year-old daughter Maxwell and 5-year-old son Ace. Simpson previously revealed they were expecting again in an Instagram post in September.

Jessica Simpson took to Instagram Thursday to celebrate a special occasion: Her daughter’s 7th birthday.

“Happy 7th Birthday to my forever best friends and baby girl,” Simpson began alongside the sweet family snapshot, referring to her eldest child, Maxwell.

“You have given me the truest, most precious purpose of life. Without question, you are the coolest, most compassionate person I know. I love you. I wish I could blame all of my tears on hormones today,” she continued.

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“Omg. Your family and this photo. Happy Birthday, Max!” wrote one fan in response.

“Happy birthday little girl!” wrote another.

“Happy birthday Maxi! Jessica you and your husband sure made the cutest little humans,” said a third.

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“Your children are seriously 3 of the most beautiful kids I’ve ever seen, very blessed,” commented a fourth.

Simpson also shares son Ace, 5, and weeks-old daughter Birdie with husband and former NFL player Eric Johnson. The couple welcomed Birdie on March 19, who the "Irresistible" singer later revealed was nearly 11 pounds the day she delivered her.

Simpson introduced Birdie to the world when she shared stunning family portraits on Easter Sunday in April.

Fox News' Jennifer Earl contributed to this report.