The fashionable claws are out on NBC's new reality show Fashion Star.
One source says the two only chat when necessary and "have wildly different opinions about style" adding Nicole doesn't think Jessica has a "high-fashion eye" and "makes snarky comments" about Simpson's outfits.
But those comments seem to be rolling off Jessica's back because she "really doesn't care what Nicole thinks".
Now ladies, everyone's entitled to their opinion — just make sure to save some of that cattiness for the cameras!
[Image via Adriana M Barraza/WENN.]