Uber-thin Giuliana Rancic is criticizing another female celeb for her small size -- and the star isn't too happy about it.

When talking about her new restaurant, Rancic recently told The Huffington Post she'd love to feed Rimes there, saying "She lost a lot of weight from all the stress in her life. She seems a little thin right now and I think she looks great when she's a bit curvier."

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Last night, LeAnn heard about Rancic's weight talk and went straight to her favorite place to respond: Twitter.

"@GiulianaRancic hey, we should go to dinner sometime," she wrote. "You get criticized all the time for how small you are. You can see just HOW much I eat and maybe put a stop to this crazy "shrinking" once and for all ... Then we should workout together! Good luck with your restaurant!!!!"

After one of LeAnn's followers said Rimes was being rude, she responded "How is that rude?! It's the truth ... I just don't appreciate her comments, so I really would love for her to hang with me, see who I am. I am a person you know."

Rancic has yet to respond ... but it's interesting that Giuliana, who can't weigh too much more than Rimes, would single out the country singer in the first place.

What do you think about the Weight War? We think LeAnn has a point here.

Sound off below, and check out more pics of Rimes showing off her thin frame in a bikini over the weekend at the beach above!

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