This is the Kerrs second child and first with husband Spiegel, who was born on May 7 here.
His cute name is said to be a tribute to Evan's grandfather.
The couple are yet to make an official announcement or statement about the birth, but fans are hoping that when they do it will include a picture of their newborn son.
Congratulations Evan and Miranda (and you too, Flynn)! "Grace Kelly was a real inspiration, with her dress and how timeless it is", the model told Vogue at the time.
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Miranda also has a six-year-old son from her first marriage to Orlando Bloom - Miranda and Flynn pictured here back in 2014.
Kerr's second pregnancy wasn't an entirely smooth ride.
She said: "I have been getting hormonal headaches, which I never got with Flynn".
The Australian star gave birth to a baby boy, named Hart, on Monday night (07May18) at Cedars-Sinai Medical Center in Los Angeles.