Getty CompositeIsaiah Hartenstein and his model wife Kourtney Kellar have a little bundle of joy on the way ... and the soon-to-be momma used her Knicks center hubby's office -- Madison Square Garden -- to make the announcement!
Kellar posted video from the floor at MSG, showing an ultrasound image and number 55 onesie (Hartenstein's #) draped over one of the courtside seats ... while Stevie Wonder's Signed, Sealed, Delivered played in the background. KK captioned the IG post, "Baby boy due June 2024 💙"
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