And unlike Luisa and Jasmine's CBB snog, this wasn't the result of a drunken game of truth or dare.
Snuggled up in bed, Lee was rather forward with his kissing of glamor model Casey, although she seemed rather uncomfortable with it all.
All too aware of the cameras watching them as they lay in bed, Casey told the Blue star: "I'm going to get so much hate now when I get out of here, you're alright!"
But it seemed to only persuade Lee to go back for more kisses, before Casey cooly changed the topic by talking about her hunger.
Only yesterday afternoon Lee insisted there was nothing going on between the pair, who entered the house handcuffed together last Friday night.
“Nothing’s going on between me and Casey," the singer said.
He explained to the group as they enjoyed a bath together: “I like her and think she’s great.
“I’m going to talk to her and have fun with her, she’s a great laugh and see’s good fun. We were having a cuddle.”
He added: “She’s a really lovely girl, I like her. She’s fun.”
Celebrity Big Brother 2014 airs nightly on Channel 5.