Kourtney Kardashian, 45, devastated as she's confused for mom Kris Jenner, 68

Kourtney Kardashian was far from happy when her nephew confused her for her mom Kris Jenner .

The 45-year-old was filmed having a fantastic time in Sydney , Australia, on the latest episode of The Kardashians and she decided to FaceTime her sister Khloe Kardashian while making a drink for her husband Travis Barker . As Khloe answered the phone, she was joined by her son Tatum Thompson.

"Want to say hi to Auntie Kourt?" Khloe asked. Kourtney gave a big smile into the camera as she asked: "Hi! Remember me?" However, it seemed Tatum didn't quite know who Kourtney was as he said: "Lovey," which is what they call Kris.

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Khloe tried to explain: "That's not Lovey. It's Auntie Kourt," and Kourtney was visibly shocked by Tatum's confusion as she struggled for what to say, before simply replying: "Oh."

Khloe wasn't happy with her sister's response and shot back: "Kourtney! That's not an insult. You could only dream." However, Kourtney was having none of it and asked: "Do I look like I’m in my 60s?"

The mom-of-four then explained her hurt reaction in a confessional. "Obviously she's my mom and she’s beautiful and she’s 20-something years older than me, so, it’s not like, the ultimate compliment," she told the cameras.

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Elsewhere in the phone call, Kourtney hit out at her younger sister's over-the-top party decorations as Khloe showed her the extravagant decorations she had bought for Valentine's Day.

"Oh cute, all your Valentine's stuff," Kourtney said, but when Khloe asked: "How is it?" Kourtney replied: "Crazy. I was gonna say, it screams 'Bad for the planet'."

Khloe was fuming with Kourtney's comments as she said: "Kourtney, not now." She then hinted she won't be doing the huge decorative displays again as she said: "Listen, give me one more year I’ll be over this."

New episodes of The Kardashians S5 stream weekly on Disney+