Pop star Ashlee Simpson welcomed her new baby girl with husband Evan Ross last Thursday, and the couple has announced their daughter's name in matching Instagram posts, People reported. They named their newborn daughter Jagger Snow Ross.

"We are overjoyed about the birth of our precious baby girl Jagger Snow Ross," a text photo read on each of Ross' and Simpson's Instagram pages. Ross tagged his wife in his post and wrote "I love you #JaggerSnowRoss we love you," in the caption.

Little Jagger Snow is the first child for Ross and Simpson. Simpson shares a six-year-old son, Bronx, with ex-husband and Fall Out Boy rocker Pete Wentz. Simpson, 30, and Ross, 26, began dating in 2013 and were married in a ceremony at Ross' mother and singing icon Diana Ross' estate in Greenwich, Conn. last August, as previously reported by HNGN.

"Ashlee is doing amazing and their daughter is perfect," a source told People after Jagger Snow's birth. "She's gorgeous!"

The couple announced their pregnancy in December of 2014 and revealed the baby's sex in February in a People exclusive. They kept their daughter's name a secret until her birth last Thursday.

"Yeah, it's unique," Ross told People in June. "You guys will figure out the story behind it once we tell the name."

See the couple's birth announcement on Instagram below.

 @ashleesimpsonross I love you #JaggerSnowRoss we love you

A photo posted by Evan Ross (@realevanross) on Jul 31, 2015 at 8:14pm PDT