AceShowbiz -

Kylie Jenner said she was "so jealous" of Kourtney Kardashian's body after she saw a photo from Kourtney's nude birthday photo shoot. In a sneak peek for the new episode of "Keeping Up with the Kardashians", the Kardashian-Jenner sisters were in awe as they watched the 38-year-old reality TV star flaunting her curves in a swimming pool.

In the short video posted by E! News, Kourtney splashed around and whipped her hair while photographer Mike Rosenthal took some photos. Kylie, who saw a glimpse of one of the photos, groaned in envy. "What the f**k!" she yelled. "I want to get in. I'm so jealous!"

Khloe Kardashian also expressed her admiration for Kourtney's body during a confessional. "I honestly was worried about [Kourtney] after Penelope," she said. "I did think, like, she's gone. Now, she's YOLO-ing it up, f**king bomb a** body, naked in the pool and your sisters should be afraid of you."

Kourtney's figure has been making a lot of people around her jealous. Besides Kylie and Khloe, Kim Kardashian was also believed to be envious of her hot beach body. "Kourtney's getting so many compliments on her body and Kim feels like she's getting nothing but hate," a source revealed. "She can't help but feel jealous." However, Kim was still "very happy" for her elder sister.