"We are overwhelmed with joy and everyone is healthy!!!" the couple's post, announcing the child was born Saturday, on Bella's Instagram page read.
The couple did not announce a name.
Bella and Bryan, who were married in 2014, had a daughter, Birdie, in 2017.
Bella's sister, Nikki, is also expecting her first child with fiance Artem Chigvintsev this year.