In the image, Wade is standing behind Union, 48, who is smiling for the camera in a white bathrobe. The basketball player appears to be entirely nude in the photo, with the exception of some necklaces.
"Birthday behavior‼️39 is already looking up 👀 🖤🖤🖤👑3️⃣," Wade captioned the racy photo.
Wade isn't the first celebrity to post a nude birthday pic that shocked their kids. Back in September, Gwyneth Paltrow shared a nude shot to Instagram for her 48th birthday, prompting her daughter, Apple Martin, to comment "MOM."
For more from Wade and his kids, watch the clip below.