The Hollywood superstar is a big fan of the UFC and she has been to many of the big fights.
Last night, she had cage side seats at UFC 209 and was caught doing a rude gesture to Polish fighter Marcin Tybura as he was walking back to his corner at the end of the round of his fight against Luis Henrique.
Theron was seen flipping him with not just one but a double bird.
There has been no statement so far from the leading lady…
Watch the video of the incident: