Sarah announced last month that she would not be returning to X Factor's ITV2 spin-off show after presenting it for a year.
While a few names had been thrown in the mix - including Zoella and Big Brother star Brian Dowling - The Saturdays singer Rochelle and Kiss FM DJ Melvin will be co-hosting the show.
Sending her well-wishes to the pair, Sarah said last night: "Really digging the fabulous pairing of my two cuties @RochelleHumes & @Melvinodoom for Xtra!!! Rock on and good luck!!!! #congrats."
Confirming their new job yesterday, Rochelle said she was "beyond excited" to join the team. Meanwhile Melvin, who is a massive fan of the primetime show, said it is a "dream" job.
Rochelle and Melvin, who are also good friends, will no doubt be the perfect pairing on the show. They already provide lots of entertainment and banter as team captains on BBC Three's Sweat The Small Stuff, so no doubt they'll bring a fun energy to The Xtra Factor.
Joining the X Factor team will be Rochelle and Melvin's Sweat The Small Stuff co-star Nick Grimshaw, who has become a judge on the show!
It was revealed earlier this week that Nick and Rita Ora would be the new judges on the show, replacing Mel B and Louis Walsh. Simon Cowell and Cheryl Fernandez-Versini remain on the panel.
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