And it didn't go unnoticed by former housemate - and the object of Lee's desires - Jasmine Waltz, who threatened to 'smack' her in one of several tweets she posted during the show.
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Casey Batchelor and Lee Ryan
As they snuggled up together in a dog kennel as part of a CBB task, a rather inebriated Casey made her rude offer to Lee.
"Do you want a b**job? We’ll call it a treatment, do you want some treatment?" she asks him.
Lee responded: "A proper treat, as a doggy treat if I had a new one."
"I’ll give you a doggy treat. That’s our code name," Casey replied.
Cue a series of colourful treats, sorry tweets, from an obviously seething Jasmine.
"NO Casey!! He doesn't want to drink with you and he doesn't want your snagle teeth on his d*** and he doesn't care your horny #Uneedasmack," she tweeted.
Another soon followed, saying: "My gwad the desperation... Have some pride for yourself."
Pride? A little late for any of that, we think.
'Celebrity Big Brother' continues on Channel 5 tonight at 9pm on Channel 5.
1. She was born on 22 August 1982 in Sin City itself, Las Vegas. (credit:WENN)
Jasmine Waltz: 9 Facts In 90 Seconds(02 of09)
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2. She starred in a sex tape and claimed to be shocked when it leaked, telling TMZ at the time: ”I’m absolutely shocked that the public is now going to see what I made with my boyfriend on Valentine’s Day. I’m not even famous which blows my mind even more, I’m just a girl in Hollywood." Ahem. (credit:Splash)
Jasmine Waltz: 9 Facts In 90 Seconds(03 of09)
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3. Her dad tragically committed suicide when she was young and her mum went on to abandon her, leaving her living in and out of care homes and shelters. (credit:WENN)
Jasmine Waltz: 9 Facts In 90 Seconds(04 of09)
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4. She became known in the US after having an affair with actor David Arquette when he was still married to 'Friends' star Courteney Cox. But he's not the only famous male she's been linked to - she's also dated Ryan Seacrest, Chris Pine, Jesse McCcartney and Sean Stewart. (credit:WENN)
Jasmine Waltz: 9 Facts In 90 Seconds(05 of09)
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5. Jasmine - pictured here in her police mugshot - was arrested in 2000 for possession of cannabis. She reportedly pleaded no contest and the court withheld adjudication. (credit:Splash)
Jasmine Waltz: 9 Facts In 90 Seconds(06 of09)
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6. She ended up in an all girl's maximum security school from the age of 16 and wasn't released until she was 18. (credit:WENN)
Jasmine Waltz: 9 Facts In 90 Seconds(07 of09)
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7. In 2010 she was rumoured to have slapped actress Lindsay Lohan across the face in a club where she was waitressing - something Jasmine denied, saying: "I didn’t hit her, but I’d like to." Charming. (credit:WENN)
Jasmine Waltz: 9 Facts In 90 Seconds(08 of09)
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8. Her movie roles have included 'Video Store Customer (Uncredited)' in 'Bad Boys 2 and 'Smoking Girl #3' in 'Pledge This!'. We don't think she'll be giving her lookylikey Megan Fox any sleepless nights just yet. (credit:Splash)
Jasmine Waltz: 9 Facts In 90 Seconds(09 of09)
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9. She studied at Miami's University of Performing Arts for three years before moving to LA where she currently resides. (credit:WENN)