AceShowbiz -

Looks like Kylie Jenner is starting to experience pregnancy struggle. According to a source, the "Keeping Up with the Kardashians" star, who is rumored to be pregnant with her first child with rapper boyfriend Travis Scott (II), has gained 40 pounds while carrying her baby, and it's making her "hate" pregnancy.

"Kylie has already gained 40 pounds," the insider revealed to Life & Style magazine (via HollywoodLife.com). "She feels huge. She hates being pregnant and says she's never felt this fat in her life." The mag also claimed that Kylie's constantly asking her pals what they think of her body. When they told her she looked great, she didn't believe it, noted the publication.

But Kylie's not the only one who is feeling totally uncomfortable with her figure. Her half-sister Khloe Kardashian, who is pregnant with her own baby, is also said to be freaking out about her "new" body, and she can't wait to get back in shape once her baby is born. "Khloe feels huge," according to In Touch. "Pregnancy has changed her body and she is very self-conscious right now."

Both Kylie and Khloe have been staying out of the spotlight since news of their pregnancy subsequently broke three months ago. The sisters, who are famously known for sharing sexy full-body photos on their social media accounts, have also stopped posting curve-baring snaps. They've been sharing either throwback pics or promotional posts for their cosmetics and clothing lines instead.

Kylie and Khloe, who is pregnant with her first child with basketball star Tristan Thompson, are due to give birth around the same time, earlier next year. Another Kardashian sister who is currently expecting her own baby is Kim Kardashian. The KKW Beauty owner, who is already a mother to two children, is expecting her third child, a girl, with rapper husband Kanye West via a surrogate.