First up are Rachel Riley and Pasha Kovalev and Richard Herring and Catie Wilkins. They tackle an impossibly dirty bathroom, have a nightmare makeover and discover that Rachel pees in the shower during our alarming lie detector test.
Fellow comedians Sara Pascoe and Steen Raskopoulos take on Blue singer Duncan James and Rodrigo Reis in a head-to-head contest to decide who has the better relationship.
Vicky Pattison and fiancé Ercan Ramadan take on Michael and Hilary Whitehall as they teach non-driver Lucy to reverse park and write each other 'romantic' poems. We'll also find out what Jack Whitehall makes of his parents' relationship.
Actress Amanda Abbington and her partner, escapologist Jonathan Goodwin, take on Pussycat Doll Kimberly Wyatt and her husband, model Max Rogers. Kimberly and Jonathan woo Jon and Lucy and there's an unconventional art class.
Television presenter Ore Oduba and his wife Portia take on comedian couple Harriet Kemsley and Bobby Mair. Can they pack a car without having an argument? And just how well do the couples know each other in the wardrobe department?
Jamie Laing and Sophie Habboo take on Marcus Brigstocke and Rachel Parris, with the couples finding themselves in flat-pack purgatory. And Jon gets a sensual massage.
