Karissa Shannon was toying with the idea of having bigger breast implants, in the Celebrity Big Brother house yesterday.

The Playboy model has had a boob job before, but her boobs only measure up as a b cup, while her twin sister Kristina has c cup implants. Yesterday, the blonde model tried on padded bras owned by some of her fellow housemates, to see how she’d look with a bigger bust.

Her sibling tried to persuade Karissa to get the operation asap, telling her sister:

You’d look so much more mature. You look great, but you’d look more womanly with bigger boobs.

When the Playboy bunny tried on Natasha Giggs’ bra, Kristina exclaimed:

Oh my God you already look so much hotter! You look so much hotter….look at that!

Oh My God you need bigger boobs, they’d look so much better.

Former glamour model Nicola McLean agreed, but thought Karissa needs to ‘even bigger’ than a d cup.

You can watch the video of all the girls boob related antics here.