Ailin Pérez may not have gotten her opponent in a rear naked choke during her UFC fight Saturday … but, she certainly got her own rear working — twerking in her opponent’s face after winning by submission.

The bantamweight fighter hopped in the Octagon at UFC Paris against Daria Zhelezniakova … and, she quickly dominated her opponent — getting DZ to tap out in the first round.

Perez jumped to her feet … and, ya gotta watch as she swished her booty back and forth right in front of her red-faced opponent, still gasping for breath.

As Daria slowly gets to her feet, Ailin keeps her backside moving … doubling down on the W with the movement of her derrière.

Perez wasn’t done twerking either … throwing it back once more after the ref raised her arm in victory — while her team pretended to throw money on her.

Apparently, this is sort of a thing BTW … the fighter pulled a similar thing back in June when she defeated Joselyne Edwards by decision back in June — so, this is sorta Perez’s signature victory dance.

While she may look stoked now … Ailin had a bit of a difficult time before this fight — missing weight at the weigh-in earlier this week and becoming visibly emotional before an official led her off the stage.