Pussycat Doll: We Don't Just Look Cheap ...

Head Pussycat Doll Nicole Scherzinger was totally blown away when she was told to pay the valet at Foxtail last night -- God forbid a hot chick should actually pay for something.

That $6 must have been rough for the platinum-selling singer -- who begrudgingly shelled out the cash before hopping into her Bentley and taking off.