The birth of Ashlee Simpson's baby with heir husband Evan Ross (son of superstar diva Diana) has been widely documented step by step through the singer's social media, and now their adorable baby daughter was born only days after Evan shared some sweet snaps of the couple's wedding day on Instagram!

After announcing they were expecting their first Ashlee Simpson baby as a couple last December, Jessica Simpson's sister and Diana Ross' son are the proud new parents of an adorable baby girl who has a name that sounds like something straight out of Diana's disco years: Jagger Snow!

According to USA Today, the couple took to Instagram once more to announce the birth of Ashlee Simpson's baby, after their bundle of joy came into the world last July 30 to the deep joy of her parents, grandparents and the rest of their family.

Both proud mom and dad posted the same announcement of Ashlee Simpson's baby, saying they were "overjoyed" to welcome their first child together, though it's Simpson's second child after 6 year-old son Bronx Mowgli Wentz from a previous marriage.

Hello! Magazine reports that, long before Ashlee Simpson's baby was born, the couple was already speaking to the press about their baby name plans and gushing about going for a completely unique one, saying their fans should "figure out the story behind it once we tell the name" - of course, it's a fairly obvious reference to Rolling Stones legendary lead singer Mick Jagger, who probably has probably known proud grandmother Diane Ross for decades.

A source close to the couple told E! Online that the name had been planned for quite some time and it wasn't remotely a spur-of-the-moment kind of thing, as they wanted something to differentiate their little girl from crowds - as if being part of music royalty wasn't enough!

Congratulations to the Simpson-Ross family over the (undoubtedly adorable) Ashlee Simpson baby girl!