Austin Reaves got creative for a gender reveal for his big bro ... surprising him by wearing pink sneakers during Wednesday's Lakers game -- and Spencer absolutely loved it!!
The L.A. star delivered the exciting news to his brother and his pregnant wife, Casey, right on the court during his game against the Pacers at Gainbridge Fieldhouse.
Reaves made his way to the hardwood rockin' pink and white kicks, signaling that the baby is a girl.