Kourtney Kardashian walked in on her model sister Kendall Jenner sleeping with her ex-boyfriend Scott Disick on Friday (01Apr16) - but it was all in the name of fun. The reality TV regulars filmed the stunt for Snapchat as they pranked fans for April Fools' Day and poked fun at tabloid rumours suggesting Scott, the father of Kourtney's three kids, has been having a secret fling with Kendall. The footage ends with Kourtney pretending to blast her ex as "sick", as he storms out of the room, shouting, "Everybody knows I’m inappropriate!", before turning to the camera and quipping, "April Fools!"