Amy Winehouse remembered Nelson Mandela’s birthday bash on Friday night. She came, she sang and she DIDN’T leave without controversy!

More pics after the jump…

Amy arrived on time, walked herself to the stage and sang.  Her performance wasn’t stellar, but she did perform.  She didn’t miss too many words and she seemed to be enjoying the crowd.  Until the end.  Amy ends up in the crowd after her performance and you can see arms and fists flying.  E! Online has a video of her incident.

No charges have been filed in the incident – but it remains mystifying.  Why? Who? What?  After Amy left the shindig, she returned to the hospital.  More treatment?

Photos: PR Photo