The glamour model is said to have dated The Voice coach will.i.am for six months.
The pair - seen together here in a photo posted on Twitter by Casey's agent Sallyanne Waterman - are alleged to have had a relationship after the Black Eyed Peas singer spent time in the UK last year.
According to The Sun: "They were dating for six months and actually never officially called time on their relationship. Will met Casey in a nightclub and they had a series of intimate dates.
"She has been very careful not to namedrop Will in the CBB house because she is aware of how much he doesn't like to talk about his love life."
The source also claims that both Casey and will.i.am are hoping they can pick up their relationship where they left off when she's out of the house...
This will be news to Casey's fellow CBB housemates, as she's been crying over her broken relationship with Blue's Lee for two weeks!
After kissing Casey during the first few days on the show, Lee then went on to humiliate Casey by turning his affections to American Jasmine Waltz.
Celebrity Big Brother continues tonight (Sunday 19 January) on Channel 5 at 9pm.