The couple exchanged 'I love yous' just 15 days into the series and have already been talking about their future together and just how much they mean to one another.
But although they both come from reality TV backgrounds and are used to sharing their personal life on camera, they're adamant they WON'T use their romance for monetary gain… unless it's a LOT of money!
In scenes to air tonight, ex-TOWIE star Lewis tells Geordie Shore's Marnie: "I would never do a spin off show with you unless it was for a million pound… love first money second."
"This is not the time or place to be really, really honest or memorable," he also says. "But I look at you and see everything I ever wanted. I've never said that to anyone as it's never been true."
He adds: "The reason I've been single is, yeah, I could be the perfect boyfriend but I'm too honest with myself. I accept nothing less than perfection and to me you're perfect."
Marnie, meanwhile, tells Renee Graziano: "I'm scared…I love him so much, I'm just worried."
Lewis is up for eviction this Tuesday night after being nominated by five housemates because of his closeness to controversial Bear. The eternally nominated Bear is also up, of course, alongside Renee and Heavy D.
CBB continues 9pm on Channel 5.