Update: Jagger Snow Ross made her Instagram debut today (September 24), wearing the world's tiniest tutu in an all-white ensemble that matches her proud parents Ashlee Simpson and Evan Ross' outfits. "She's beyond everything!!!" Ashlee writes, saying she has "the best baby daddy in the world."

Bronx Mowgli's new sibling has an equally colorful name — Ashlee Simpson and Evan Ross' new daughter officially answers to Jagger Snow Ross! Simpson-Ross first shared the news in an Instagram post on August 1 (related: Ashlee has an Instagram now).

According to E! News, Ashlee gave birth on July 30. A source said, "Their whole family was around to support them. Evan was very emotional and loves Ashlee so much. He did not leave her side and wanted to go through this with her every step of the way. He can't wait to be a dad. 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.”

And a baby isn't the only thing Ashlee and Evan have collaborated on recently! That's our really cute way of saying they recorded a song together.

We had a chance to talk to Evan earlier this year, and he told us all about it: "We did an amazing song together, and we’re trying to figure out what to do with it because I feel like it’s got its own feel to it. It’s called “Permission to Love” and at first we were like 'Oh, we should put it on the album,' but I almost think it should have its own thing. So we’re trying to figure out what that is."

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