But the girls did show up on Wednesday, Jan. 15, and as expected, Chelsea Handler didn't hold back—asking the Keeping Up With the Kardashians stars all about Harry Styles, Jaden Smith, baby North West and everything in between!
"Were you scared when we met the other night?" Chelsea asked Khloé, Kourtney and Kim Kardashian's kid sisters.
"No, but that was in a comfortable place," said Kylie, 16, adding laughingly, "If you scared me, I could go to my mom [Kris Jenner] and say, 'She scares me!'"
It was then that the late-night host started to grill the sisters on their rumored "boyfriends," asking knowingly, "Are you not public about that—do you not talk about that?"
"No. We don't talk about that," said Kendall, 18.
"It's in the papers!" Chelsea, 38, interjected. "Do you really not talk about it?"
Kylie and Kendall couldn't help but laugh at the late-night host's persistence, but they weren't going to gab! "I don't want everyone to know [everything]," Kylie said.
"OK, so you're single, and you're not dating Harry Styles?" Chelsea asked Kendall, then pointed to Kylie. "What's his name—it's fine, you don't have to say anything! You can be like, 'We didn't talk about our personal lives. Chelsea did!' Oh, Jaden—Jaden Smith! That's who was there [when she saw the girls the other night]. I don't know if you're dating him, and Harry Styles—I don't know if you know him—he was there."
"He made me eggs that night," Chelsea joked. "He actually called me the other night…and left me a message!"
"How sweet," Kendall said with a smile.
"Just in case you are dating him," Chelsea quipped, "he's obviously got something for older women!"
She then admitted the One Direction boy-bander "actually didn't say much," joking to Kendall, "I won't tell you [more] because you obviously don't even know him!"
When Chelsea realize she wasn't getting anywhere on this, she asked Kylie and Kendall if they were "babysitting a lot" for their nephew Mason Disick and nieces Penelope Disick and North West.
"Yeah, we are," the sisters answered in unison, saying that taking care of the youngest family members is "really fun."
Watch the two-part season premiere of Keeping Up With The Kardashians Sunday and Monday night at 9/8c only on E!