Paula Beckert's Instagram

Paula Beckert had a winning "Challenge" streak when she was on a team of two, and now the 10-time competitor is about to have a pairing of her very own: The two-time champ is expecting her second bundle of joy!

The "Real World: Key West" alum -- who welcomed son Atlas with hubby Jack last July -- shared her exciting news with a heartwarming Instagram collage featuring her precious son, a glimpse of her bun in the oven via a sonogram and the bundle of joy's gender. Make way for a mini-me Walnut!

"We are so excited to announce that our family is growing and Atlas is getting a promotion to #bigbrother #yourehired #itsagirl #blessed #family," the doting mama captioned the sweet snap. The soon-to-be older sib certainly appears pumped about his new role (THAT T-SHIRT WE NEED IT), and his mama certainly has that pregnancy glow (no evidence of a Pukeagonia repeat). Wonder if these kiddos will have a good ol' rivalry? Their mom does know a thing or two about that, and she reaped the rewards...

While P didn't disclose her petite-princess-on-the-way's due date, this munchkin will be very close in age to another "Challenge" addition: Theresa Gonzalez just revealed she is avec child.

Be sure to offer your congrats to Paula and her family below, and stay with MTV News for more updates on the upcoming 27th installment of the long-running game series!