The Dutch star revealed her happy baby news via Twitter on Wednesday afternoon (30 July), sharing the first picture of the new arrival.
In the photo, a make-up free Doutzen is seen cradling little Myllena while sitinng with husband Sunnery James and their son Phyllon.
Doutzen told fans: "A miracle saw the light of day this morning. Welcome Myllena Mae. Mommy, daddy and brother Phyllon are super proud!"
The 29-year-old gave birth in her native Netherlands, tweeting two days ago that she was "enjoying a beautiful sunset on the coast of Holland awaiting our baby girl."
She revealed the sex of the baby back in March, and later told Glamour that she was so eager to have a daughter she made two separate doctors confirm it truly was a baby girl.
Her son Phyllon Joy was born in January 2011.
Reveal is now on Google Plus! Join us here for the latest pictures, fashion and celebrity news!
Stars who welcomed babies in 2014:
Copyright: Rex Features WENN/Matthew Taylor/Daniel Deme/Josiah True/Matthre Taylor/Joe