Kerr gave birth around 11:50 pm on Monday evening at the Cedars-Sinai Medical Center in Los Angeles. He's reportedly named in honor of Evan's grandfather, who was a prominent San Francisco attorney.
Keep your eyes peeled for pictures of little Hart in the coming weeks!
Meanwhile Miranda gave birth to first son Flynn Bloom back in January 2011. The 33-year-old model announced her engagement to the 26-year-old via Instagram in July 2016.
The couple got married in an intimate home ceremony a year ago.
Baby Hart joins 7-year-old Flynn, Kerr's son with Orlando Bloom.
Whilst Miranda and Evan are no doubt thrilled at the arrival of their son, one family member who definitely couldn't be happier is Flynn, whom Miranda previously stated was desperate for a sibling.
Last December, Kerr revealed that she was experiencing more complications with her second pregnancy than with her first.
"He's very excited. It's so sweet".
In May, the former lingerie model married Spiegel in what was described as an intimate celebration in the backyard of his home in Los Angeles.