Bloom reposted a message, first shared by UNICEF, announcing the arrival of his and fiancee Katy Perry's daughter, Daisy, under which Kerr shared her sweet comment about the exciting occasion.
"💖🙏🏻🌈 I'm so happy for you guys," Kerr wrote. "Can't wait to meet her 💖🙏🏻🌈."
Bloom and Kerr, who were married from 2010 to 2013, share a child of their own -- 9-year-old son Flynn.
Kerr, meanwhile, got remarried in 2017 to Snapchat co-founder and CEO Evan Spiegel. The pair share two sons -- 2-year-old Hart and 10-month-old Myles.
As for Bloom and Perry's new bundle of joy, the pair revealed the arrival of their baby girl in a statement shared by UNICEF, an organization both stars work with as goodwill ambassadors.
"Welcome to the world, Daisy Dove Bloom! We are honoured to introduce Goodwill Ambassadors @KatyPerry and Orlando Bloom's new bundle of joy," the organization wrote, alongside a photo of the new parents holding their baby's tiny hand.