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The party must go on.

With Scott Disick is undergoing treatment in Costa Rica, Kourtney Kardashian decided to take a mini-vacation Saturday, so the Keeping Up With the Kardashians star hosted the season preview at Marquee Dayclub at The Cosmopolitan of Las Vegas. Looking ferocious in an animal print Roberto Cavalli dress, she gave E! News an update on Disick's rehab stay. "He is not home yet, but he is doing well," she said.

Scott was scheduled to return home by Monday, but he's having a positive experience and will extend his stay. "Now it's just a maintenance program," a source tells E! News. "He is choosing to stay longer."

Kourtney, a mom of three kids, is supportive of Scott's decision. "He's doing well, and, you know, really focusing on himself and working on himself. He's made a lot of progress, so I'm proud of him," she said.

Hopefully Scott stays on the straight and narrow when he hosts a party at Las Vegas' 1Oak Friday.

Kourtney is quite proud of her own progress, too—albeit for a different reason than Scott. Ten days ago, she stepped onto the scale and found out she weighs 120 lbs. "First day that I have seen this number in a while," Kourtney wrote on Instagram. "It's been easier this time than it was last time, for some reason, to lose the weight. It's still in progress, but [Khloe Kardashian] has been working out with me," she said.

"I can't flake on her," Kourtney said of her sister. "She would probably come drag me out of my house."

Though she's excited to be getting her post-baby body back to its pre-baby size, Kourtney hasn't ruled out giving Mason, Penelope and Reign another sibling. "We were all in a group text this morning with my mom [Kris Jenner], [Kim Kardashian] and Khloé, and they were like, 'Wait, you would do No. 4?' I just said, 'Next time, if I have my baby in December again, I'm not going to mom's Christmas Eve party.'"

"They were like, 'Wait—a next time?' But, you know, I don't know," she said. "It's up to Scott this time."

Tune in for new episodes of Keeping Up With the Kardashians, Sundays at 9 p.m., only on E!