UFC's Arianny Celeste Is Pregnant, Skipping UFC 251

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.

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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.

Taylor King @theking_

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.

Taylor King @theking_

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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