Khloe Kardashian Calls Kylie Jenner a ''Little Bitch'' for Not Inviting Her & Kourtney to Her Birthday Party on KUWTK: Watch

Kylie Jenner has some explaining to do!

On this Sunday's episode of Keeping Up With the Kardashians, Khloe Kardashian and Kourtney Kardashian find out that Kylie didn't invite them to her upcoming 18th birthday party.

In this first look clip from the episode, the sisters decide to call Kylie and confront her about her party.

"What a little bitch Kylie is," Khloe says. "I'm calling her now."

Khloe gets Kylie on the phone and says, "So I just heard you're throwing a huge birthday bash?"

Kylie tells her that she is and when Khloe asks if there's a reason she and Kourtney weren't invited Kylie tells her she hasn't told anybody yet.

"I'm not gonna tell anybody until I for sure know where I want it and everything," Kylie explains.

"Well don't you want us to hold the date?" Khloe asks Kylie. "What if we're busy?"

Khloe and Kourtney then decide to mess with Kylie, telling her that they're both busy on the day she wants to have her party.

"I have an event on August 10," Khloe says.

"Where?" Kylie asks.

"San Fransisco," Khloe tells her.

"Well can you fly back from San Fransisco or something?" Kylie asks.

"If you beg me hard enough," Khloe says.

Khloe then asks Kylie, "Who would you most want to come out of all your sisters?"

Check out the clip above to find out Kylie's answer!

Watch an all-new episode of Keeping Up With the Kardashians Sunday at 9 p.m., only on E!