Caleb and Rachel are preparing to race around the world for $1 million, according to TMZ, which did not report who will serve as their racing partners.
The website reported last week the entire cast of The Amazing Race will be comprised of former Big Brother houseguests; however, there have been subsequent rumors the Season 31 cast will actually be a mix of Big Brother veterans as well as returning The Amazing Race contestants.
Sources close to production initially told TMZ the lineup of teams for The Amazing Race's new season has already been locked down and producers are very happy with the outcome.
Caleb -- who became known as "Beast Mode Cowboy" -- first appeared on Season 16 of Big Brother.
Caleb went on to compete on two Survivor editions. He was unfortunately medically evacuated from Season 32 of the CBS franchise, but then Caleb was given another chance to play on Survivor: Game Changers. Caleb, however, was the third castaway voted out on Season 34.
As for Rachel, she found fame when she competed on Season 12 of Big Brother. She then returned for Season 13 and won the $500,000 grand prize.