Make way for a future Challenge competitor: Jonna Mannion is pregnant!

The sweet-natured gal -- who appeared on Rivals, Battle of the Seasons, Rivals 2, Free Agents and Battle of the Exes 2 -- is expecting her first child. But the Real World: Cancun alum wasn't the one to spill the baby beans -- a fellow cast member was responsible for sharing the exciting news.

"Our new baby momma @jonnamannion," Rivals III player Camila Nakagawa captioned the beachy photograph above, which finds the mama-to-be getting some belly love from her Rivals 2 partner Nany González and the Battle of the Exes champ. This little munchkin is going to have some loving aunties!

Jonna -- who has the distinction of winning her very first Challenge mission during the 2011 installment -- has yet to share any updates regarding her bundle of joy on the way. But the tiny guy/gal will have some MTV friends who are close in age -- like Jasmine Reynaud's mini-me, Laura Waller's daughter and Theresa Gonzalez's girl!

Be sure to offer your congratulatory messages for Jonna in the comments -- and catch the special 90-minute premiere of The Challenge: Rivals III (featuring Nany and Camila!) tonight at 10/9c!