The sisters looked gorgeous during their appearance on the show.
Khloé wore a white suit, Kourtney was in all black, while Kim picked an Asian-inspired short dress. (She seemed very conscious about showing her underwear the whole time.)
Among other things, Jimmy got Kim to reveal the possible name of her fourth baby, a son.
The sisters talked about Kourtney's upcoming big 40th birthday party (she doesn't want balloons and has "lots of rules," Khloé lamented); how Kim explains to North West why paparazzi constantly chase them (in a clip from KUWTK, Kim hilariously breaks it down for her: "Well, to get very technical, my name is Kim Kardashian and your daddy is Kanye West"); and Kanye saying he's moving to Chicago and Kim's reaction. Most notably, though, Kim revealed what she's planning to name her soon-to-be-born son. "I was just truthfully thinking about naming him Rob," she told Kimmel. "But then it's kind of like, North, Saint, Chicago, and ... Rob. But I really was feeling that [name]. And my brother approved it. So that's, like, one name."
Of course, Jimmy had to ask Khloé about Tristan Thompson.
Jimmy Kimmel dared to go there: "I do want to ask about this character that you had a baby with. Is it time to stop dating basketball players?" Kimmel asked without missing a beat. The audience seemed to support that notion, while Khloé looked visibly unformfortable. She handled it like a pro, though: "I don't know, I like what I like, what can I say?"