Blac Chyna outdoes pal Amber Rose by wearing VERY low-cut top and flashing massive diamond from Rob Kardashian at pool party

 Blac Chyna and Amber Rose got into a cleavage war on Saturday.

The models both showed off their impressive decolletage while at The Pool After Dark party at Harrah's in Atlantic City, New Jersey.

And it appears as if Chyna won as she offered a clear view of her chest in a plunging white top. 

The ex of Tyga won extra points for showing no modesty when flashing that massive diamond engagement ring from beau of only three months, Rob Kardashian.