Kim Kardashian Confronts Khloe for 'Flirting' With Lamar Odom on New Episode of "Keeping Up With the Kardashians"

— -- Kim Kardashian is showing her protective side on this week's episode of "Keeping Up With the Kardashians."

In a teaser clip of Sunday's upcoming episode, Kim confronts sister Khloe after she witnesses Khloe flirting with ex-husband Lamar Odom on the phone. You can watch the clip at People.com.

Kim and Khloe are hanging out in the kitchen together when Khloe gets a call from Odom, a former NBA star. As Khloe moves to another room to talk with her ex-husband, Kim seems frustrated and visibly annoyed about the situation.

In her confessional interview, Kim Kardashian shares her wariness about Khloe speaking to Lamar. "I don't know why Khloe and Lamar are talking, but he hurt her so badly," the reality TV star explains.

"As a big sister I'm just really protective, and for her just to be flirting with him on the phone makes me sick to my stomach," Kim continues.

Khloe and Odom split in December 2013, after four years of marriage.

Khloe, 31, filed for the divorce amid rumors of Odom's alleged drug use and infidelity, citing "irreconcilable differences."

Kim, 34, confronts Khloe about her interaction with Lamar after she hangs up the phone.

"I just can't take it," Kim tells Khloe in the clip. "The fact that when he decides to come around and be friendly, you're like, flirting with him."

"I'm flirting with him how?" Khloe retorts. "By answering the phone and saying hello?"

Kim replies that she thinks Khloe is "way more attentive" to Odom than to her most recent ex-boyfriend, French Montana.

"Why would French and Lamar even be in the same category," Khloe responds.

The full "Keeping Up With the Kardashians" episode will air this Sunday, Oct. 4 at 8 p.m. ET on E!.