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Simone Biles' Boyfriend Warns Zac Efron to Back Off!

Simone Biles' Boyfriend Back Off, Zac Efron ... She's MINE!!!

8/17/2016 1:42 PM PDT

Zac Efron's officially been put on notice ... Simone Biles' BF fired off the warning shot.

Arthur Nory Mariano -- also a stellar gymnast reppin' Brazil at the Olympics -- just tweeted at Zac to back off his gold medal winning GF. He's joking ... we think.

Arthur's an Olympic medalist and Zac's packing heat ... a very nice 12-pack for any party.

The question is ...

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