Reports are flying in that Toxic Britney Spears allegedly spent an evening of her recent trip to Mexico drinking on her own and singing to an empty bar, according to staff working at the resort where she was staying. The singer booked herself and her British photographer boyfriend, AdnanGhalib, in to the high end Rosario Beach Hotel last week, but was seen enjoying a lonely drink by the bar, where she recited slurred song lyrics. Gustavo Lopez, the reception manager of the hotel, says, "One of our waitresses spotted Britney singing to herself in the bar. She heard her mumbling the words to Toxic. "My barman said she looked like she was on drugs."