Brad and Tori Fiorenza are building their very own "Challenge" team: The former MTV stars, who walked into the "Cutthroat" sunset with a cool collective $80K back in 2010, just welcomed their second son:

Baby C joins three-year-old big brother John in the family fold.

Before the little guy's highly anticipated arrival, the OG "Real World: San Diego" alum gushed about the impending birth -- which elicited some hearty congrats from some very familiar competitors:

Now, for a relationship rewind: The future Mr. and Mrs. first met on "Gauntlet III" back in 2007 and from there, the then-engaged couple went on to compete on "The Duel 2" and then as husband and wife on "Cutthroat." Paging Brad's former roomie Jacquese to offer up a colorful chant for the dad...

Wish your hearty congrats to the Fiorenza bunch in the comments below, and be sure to catch a brand-new episode of "The Real World: Skeletons" tonight at 10/9c, followed by "Battle of the Exes 2" at 11/10c. And for a trip down memory lane, watch the proud parents take the "Cutthroat" crown in the clip below!