According to TMZ:

Future and Blac Chyna were definitely together Friday night in D.C., and it’s pretty clear now they’ve hooked up.

Future had a concert at Echo Stage … then went to his after-party where Chyna was right by his side.
We’re told they were there for around an hour … never apart.

Future and Chyna left together at 4 AM.

‘Nuff proof?

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