“Which of these sisters has Justin Bieber been with?” he said, listing Kourtney, Kendall, Kylie Jenner and “all of the above” as the reality personality’s options.
“None!” said Khloé, laughing. “It would be amazing if it was all of the above, though.”
And the Kocktails with Khloé host had to reference the singer’s well-endowed nude photo snapped by paparazzi during a skinny-dip: “We’re thankful for Justin Bieber’s … you know.”
Multiple sources told PEOPLE last month that Kourtney, 36, and Bieber, 21, had a flirtatious fling, though he’s since moved on with Hailey Baldwin.
“Oh God, this is weird,” she cried. “And there’s no reason why, ugh!”
Watch What Happens Live airs Sunday-Thursday at 11 p.m. ET on Bravo.