Kim Kardashian is coming to Jessica Simpson's defense – one curvy girl to another – following a slew of reports ridiculing Simpson's fuller figure.

In an exclusive interview with PEOPLE Wednesday, Kardashian, 28, said, "Call me crazy, but when I saw the picture [of Simpson performing Jan. 25 in Pembroke Pines, Fla.], I was like, 'Oh my God, Jessica looks hot!' "

Kardashian, whose E! reality show Keeping Up with the Kardashians returns in March, says she has no issues whatsoever with Simpson's outfit, which many critics slammed. "I actually love the outfit. I think she looks amazing. I love high-waisted jeans, I loved that belt, and her hair looked fabulous."

Adds Kardashian, who's attending the Super Bowl this weekend with football player beau Reggie Bush of the New Orleans Saints, "I get that she does look curvier, but to me, there's nothing wrong it."

No stranger herself to barbs about her own curvy physique, Kardashian says, "It doesn't really bother me anymore. I love curves. Being super skinny just isn't attractive to me. When I saw that picture, I knew everyone was going to say something. And I thought, 'You know what? Leave Jessica alone!' She's fabulous, she's a really sweet girl, and I admire her for putting up with it."

That sentiment is echoed by Simpson's sister, Ashlee Simpson-Wentz, who posted comments on her blog saying she is "completely disgusted" by headlines about her sister's weight.