![](https://cdn.statically.io/img/imagez.tmz.com/image/d4/16by9/2020/06/30/d4e9017cfc0c5b8ab2164e9a30e0e96f_md.jpg)
Arianny Celeste -- the most famous UFC Octagon girl ever -- has announced she's pregnant ... and will be stepping away from the cage for a bit.
34-year-old Celeste tells TMZ Sports ... she and her boyfriend, Taylor King, are expecting their first child in September.
![](https://cdn.statically.io/img/imagez.tmz.com/image/e9/4by3/2020/06/30/e9635469dbe3483995e68bd4613e612c_md.jpg)
Celeste says she hasn't been working UFC events recently due to the pregnancy -- and plans on taking some time off until after the baby is born. So, she won't make the trip to Fight Island for UFC 251.
![](https://cdn.statically.io/img/imagez.tmz.com/image/30/4by3/2020/06/30/30648cf366ea456c8eea680c32ffd29e_md.jpg)
But, don't worry, Celeste says after the kid is born she plans on returning to her job ... and tells us UFC -- including Dana White -- have been nothing but supportive.
Celeste has been working UFC fights since 2006 and blew up after that -- modeling for everyone from Playboy to Sports Illustrated and more.
Arianny says she doesn't know the sex of the kid yet -- but she's excited to find out.
Celeste and Taylor King (a professional photographer) have been dating for roughly a year ... and Arianny says he's her "soulmate and my best friend."
Oh, and if you like the maternity pics -- Taylor shot 'em!
Congrats!!
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