Which Real Housewife Did Countess LuAnn Finally Use Her Infamous 'Be Cool, Don't Be All Uncool' Line On?

Finally!
Ever since Bravo started promoting the new season of The Real Housewives of New York, we’ve patiently been waiting for Countess LuAnn to utter her infamous line, “Be cool, don’t be all, uncool.”
It became so popular with fans that LuAnn actually incorporated it into her newest single Girl Code!
Well, on Tuesday night’s all new episode of the hit docu-series, the line was finally unleashed on one of the model’s fellow cast mates.
So who got the brunt of LuAnn’s well-timed quip?
[ Related: Kim Zolciak & NeNe Leakes’ Spin Off Got Cancelled! ]
It was actually constant peace-maker Heather Thomson who faced the words after she confronted LuAnn for letting a man sleep in her suite while vacationing in Turks and Caicos!
We get why Heather was upset since a stranger was sleeping so close to her, but we also understand why LuAnn was annoyed since it was actually Ramona Singer‘s guy in the first place!
Ch-ch-check out the best line from Season 10 of RHONY (above)!!!