Shortly after Jack shared the exciting news, his sister, Kelly, took to Instagram to congratulate him on the arrival of baby No. 3.
"Congratulations to my brother @jackosbourne & his beautiful wife @lisaosbourne on the birth of #MinnieOsbourne," she wrote. "She is perfect in every way. It was such a beautiful experience to witness the birth of this angel. I love you both so much. #ProudAuntie ?"
Congrats to the happy couple!
In more baby news, Kylie Jenner gave birth to her first child with Travis Scott on Feb. 1. Although fans are already speculating what the two will name their baby girl, a source tells ET they have not yet settled on a moniker.