“Milano dropped me off a king on my birthday! #thebestgift,” Mill tweeted.
Harris announced she was pregnant back in December at one of her fashion shows. Mill didn’t confirm it until February during a Twitter feud with ex Nikki Minaj.
The fashion designer documented her pregnancy on Instagram.
“I’m a creative, so I didn’t want to announce my pregnancy to the world or even to my family with just a photo of my baby bump,” Harris said in an Instagram video after the announcement.
She wished Mill a happy birthday on Instagram, but has not yet posted about the birth.
Mill also has two other sons, Murad and Rihmeek, from previous relationships.