A photo posted by @ashleesimpsonross on

Introducing Miss Jagger Snow Ross!

Ashlee Simpson Ross officially debuted her and Evan Ross' 8-week-old baby girl on Instagram Thursday. As you can see in the photo, mom and dad both look completely smitten with their tutu-wearing little lady!

"We love her so much!!!" wrote Ashlee, 30. "She is beyond everything!!! I have the best baby daddy @realevanross In the world. Love you."

There's no shortage of love for baby Jagger on the Simpson or Ross side of the family! A source told E! News exclusively that Ashlee and Evan's families were both on hand for support them when their daughter was born July 30. 

"Evan was very emotional and loves Ashlee so much," added the insider. "He did not leave her side and wanted to go through this with her every step of the way."

The Hunger Games star, 27. couldn't "wait to be a dad," added a source. "He would do anything for Ashlee and now this baby girl. Ashlee is doing great and can't wait to get home to to be with her family."

This is the first child for Evan, 27, and the second for Ashlee, who has a 6-year-old son, Bronx, from her previous marriage to Pete Wentz.

Bronx already had some big brother experience when Jagger was born—his dad Pete and model girlfriend Meagan Camper gave birth to a son named  Saint Laszlo in August 2014. But as Ashlee told E! News after announcing her pregnancy, Bronx was really looking forward to having his first younger sister!

"He's excited. He's so excited," she gushed. "He's excited that it's a girl. He thinks it's cute—the tea parties—she'll be adorable."

Jessica Simpson's daughter Maxwell, 3, will probably be thrilled to have another girl in the bunch of cousins, too. She spends lots of time with her brother Ace, 2, and her boy cousins, she's going to need a partner in crime the next time she decides to raid mama Jess' makeup drawer!

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