It's always a hoot when the pair get together - and the open rounds of The X Factor auditions was no exception.
They came together to film for the first time since they were announced the new X Factor hosts.
After making a huge impression with fans - and Simon Cowell - when they hosted The Xtra Factor in 2011, the firm friends were the obvious choice when Dermot O'Leary announced he was leaving earlier this year.
Simon describes singer Olly, 30, and Caroline, 35, as a "brilliant double act" and we have to agree!
Chatting to fans at Event City Manchester for the open rounds of The X Factor auditions, the pair were seen goofing around in front of the cameras.
After a morning filming, Olly - who came second to Joe McElderry on The X Factor 2009 - tweeted: "Great 1st morning back with cazza!! #thatsright."
Meanwhile, Caroline - looking HOT in a short black playsuit - shared a picture of the pair from four years ago alongside a picture of them now, with the caption 'Back Together'.
She added: "Good luck to everyone heading down to the Open auditions in Manchester today!!!! Hopefully see you there.
"Been here 5 minutes and Olly already thinks he's lost weight.... Off his TOES."
Could these two be the next Ant And Dec?
The X Factor's most shocking moments:
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