The singer and designer, who is married to former National Football League player Eric Johnson, welcomed a new daughter on March 19, Simpson announced on Twitter. The proud mama shared the happy news on Instagram, calling their youngest child their "perfect daughter". Birdie hatched at 10-pounds, 13-ounces.
A little "birdie" spilled the name Jessica had chosen for her baby girl a little earlier on.
In October, Simpson spoke with ET in NYC about her pregnancy and getting to share the exciting news with Maxwell and Ace.
The lovely little Birdie Mae Johnson arrived today, March 19th.
The "With You" singer later said she managed to control the swelling by experimenting with cupping therapy, an ancient Chinese massage technique thought to increase blood circulation.
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"[She's] so excited about having a third baby and expanding the family", a source told E! "Everyone is trying to be patient, but the family is so excited and counting the minutes until the baby is here".
This is her third child with husband Eric Johnson.
"Jessica and Eric absolutely thought they were done having kids after Ace was born - one of each was flawless", a second insider told PEOPLE.
Despite that, Simpson quipped that another child "would definitely have to be a bit of a miracle" but that she had "baby fever" regardless.
On Monday, just before Birdie was born, Jessica took a hilarious Instagram snap of herself with the caption "Jess-tation". "Eric is the best dad too - there is a lot of laughter in that house".