Khloé Kardashian addresses if she's 'sleeping' with ex Tristan in lie detector test

Kourtney Kardashian has awkward reunion with ex Scott Disick at son's 13th birthday bash in LA

Kim Kardashian flaunts VERY tiny waist as she celebrates nephew Mason Disick's 13th birthday in LA

Khloe Kardashian rocks skintight black bodysuit at nephew Mason Disick's 13th birthday party in LA