Viewers were left stunned when Kavana upset Keith following a night of drinking, telling him he is a "one-trick pony" and to "f*** off" as they got ready for bed.
Keith looked visibly shocked by Big Reunion star Kavana's behaviour and fans were quick to react on Twitter, using the hastag '#TeamCheggers'.
One tweeted: "Poor Cheggers! Kav you haven't done yourself any favours there pal!" Another added: "If Cheggers was a one-trick pony he wouldn't have lasted nearly 50 years in the business, yeah explain that one Kav #CBB #teamcheggers."
Even Kavana's 5th Story bandmate Adam Rickitt sent his sympathies to Keith. Last year, during an episode of The Big Reunion, Kavana was shown laying in to Adam in a hotel room after a heavy drinking session.
Adam tweeted during the show last night: "#cbb Cheggers mate...know that feeling!"
Meanwhile, Kavana spoke out about his binge-drinking past in an interview with The Sun before he entered the CBB house and he vowed to "take it easy".
Kavana told the newspaper: "I don't want to speak too soon and say I won't drink. I'm not a nasty drunk. If I do decide to have a few drinks, it will surely be just good fun."
He added: "The Big Reunion - it gave me a kick up the bum. It was really hard to watch but I had a good response from it and took it as a positive."
Earlier today, it was confirmed that Kavana has since apologised to Keith for his behaviour.