New details have emerged about Britney Spears's pre-rehab afternoon at the Mondrian Hotel. Us mag is reporting that the popstar arrived at the hotel early Saturday morning, just hours after shaving her head. Spears allegedly had no credit cards or cash and was denied a room - so she stripped to bra and panties and set herself up by the pool. "It was sad," a source told the mag. "It looked like she really needed a friend." Close to noon, Spears (in a wig and hat) struck up a conversation with a girl in the pool bathroom, who offered the loan of a bikini. After changing in the girl's room, Spears reportedly "grabbed four or five bottles" out of the minibar "and just started mixing everything and drinking them," according to the insider.