Winehouse's spokesman revealed in statement: "Amy Winehouse was questioned this morning at a London police station in connection to an incident in Camden in the early hours of 23 April, 2008.
"She admitted to a common assault by slapping a man with an open hand and accepted a caution.
"Amy was fully co-operative with inquiries and apologised for the incident. She thanked the police for their professional handling of the matter. There will be no further action taken."
Receiving a caution means that Amy Winehouse has not been charged, however, the incident will remain on her record and could be used against her in future.
Police say that the singer was kept in the cells overnight because she had not been in a fit state to answer questions when she arrived.
