ROBERT PATTINSON was photographed with a "mystery blonde" at the Dream Hotel in New York City over the weekend.  (Yes, that's the same place Lindsay Lohan and her mom were partying before their big fight yesterday morning.)  And there are pictures to prove it.  (Here they are.)  (TMZ)

They weren't alone, so it wasn't necessarily a date.  But a source says, "It looked like Robert only had eyes for the girl, they sat really close to each other on the couch."