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As we previously reported, Serena and her (now) husband Alexis Ohanian went all out on the party -- and due to the fact the guys from BBD were there and wearing matching clothing ... we're guessing they performed live.
The decorations were tennis-themed -- the guest seating placards were in the shape of Wimbledon and U.S. Open trophies. Pretty damn awesome.
We'll have more on this throughout the day-- so keep checking back!