Amanda Bynes allegedly walked around a New York tanning salon completely naked.

The 26-year-old What I Like About You actress - who recently pleaded not guilty to two charges of driving on a suspended license in California - is said to have shocked customers by walking into the salon's reception area without any clothes on moments after being set up in a private room for a Mystic spray-tan session.

"She walked out of the room completely naked. She didn't seem to care that everyone saw her naked. She seemed totally out of it. She took her time walking back to the Mystic room, dragging her fingers along the wall and smiling at customers who passed her. There was definitely something wrong with her," a customer said.

Amanda - who claims to have retired from acting - has displayed erratic behavior in recent months, and has been dropped by her agent, publicist and entertainment lawyer after they found they had been unable to get in touch with her for four weeks.