He also shared sweet photos of the family in the hospital, showing the couple cradling their daughter, who was sporting a hat with a pink pompom on top. The Wades did not immediately reveal the baby's name.
It comes after Gabrielle, 46, revealed her heartbreaking struggle to conceive and multiple miscarriages a year ago.
Gabrielle detailed her ongoing struggle to conceive in her autobiography, We're Going to Need More Wine, revealing that she's had at least eight or nine miscarriages.
In the post, Wade welcomed the baby girl born Wednesday night via surrogate using lyrics from Bill Withers' song "Lovely Day".
France, Germany advance compromise for EU-wide digital services tax-MNE
The digital tax, sometimes called the " Google tax" for the impact it would have on Google and cohorts Apple , Facebook and Amazon, is deeply controversial.
The baby is Wade's fourth child and Union's first. "Welcome to the party sweet girl". Instead of diagnosing me, [doctors] were like, 'Oh you have periods that last nine or 10 days and you're bleeding through overnight pads, perhaps there's something more there.' Every doctor that I saw was like, 'Let me put you on birth control.' The pill can mask all sorts of things.
"For three years, my body has been a prisoner of trying to get pregnant - either about to go into an IVF cycle, in the middle of an IVF cycle, or coming out of an IVF cycle". His three sons are Zaire, Xavier and Zion, and Zaire Wade is now a junior at American Heritage High in Plantation and a college basketball recruit that has received a scholarship offer from Nebraska, Union's alma mater.
Gabrielle is known to have a great relationship with her stepsons.
The US star first started dating basketball player Dwyane in 2009 and tied the knot in August 2014 following a brief break in 2013 due to work commitments.
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