By Breaking Celebrity News Staff

Giuliana Rancic and LeAnn Rimes might be headed for a showdown -- and there won't need to be a weigh-in for this one!

The heat stems from Rancic's recent comments about Rimes' slight physique, after the 35-year-old E! host told The Huffington Post she thinks the bikini-loving singer needs to put some meat on her bones.

"She lost a lot of weight from all the stress in her life," Rancic told the website. "She seems a little thin right now and I think she looks great when she's a bit curvier."

Rimes was none too happy, calling out Rancic on Twitter quicker than you can say “Brandi Glanville.”

She wrote, "@GiulianaRancic hey, we should go to dinner sometime. 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!!!!"

When one of Rimes' followers ask