Kavana - real name Anthony Kavanagh - entered the CBB house alongside 13 other famous faces last night (7 January) but wasn't too complimentary when discussing his Big Reunion co-stars.
Speaking in his video package before heading in to meet his housemates, Kavana said: "I did come back recently on a show called The Big Reunion.
"It was me, Gareth Gates...erm...Adam Rickitt... This is going to be really bad if I can't remember. Dane Bowers and Kenzie - the man band."
He then added: "My attitude to life is, 'f*** 'em all'." Err, surely he doesn't mean his bandmates?!
Not only did Kavana appear alongside the lads for the hit ITV2 reality show, they even toured together along with their fellow Big Reunion boy bands in October.
However, despite the dig, it seems 5th Story are still rooting for their forgetful friend as he goes up against the likes of Calumn Best, Nadia Sawalha and Katie Hopkins in the CBB house.
Dane was even in the audience at the launch last night, and later tweeted: "So there you go!! Gotta say. AMAZING lineup this year! Gotta root for my boy @kavana_official of course but I actually like a lot of them."
Meanwhile, adanAdam - who has been on honeymoon with his new wife Katy Fawcett - told his followers: "See you soon @kavana_official #muchlove #keepthehomefiresburning."
Even Kenzie was happy to back the singer: "Kav's a great lad! Hope you get to see the good side of him!" he said. Gareth, however, has not passed comment.
Celebrity Big Brother 2015: The full lineup
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