The `Prince Charming` hitmaker - who suffers from bipolar disorder - has been hospitalised under the mental health act weeks after a series of troubled public appearances, including aiming a tirade of abuse at Christians during a charity performance.
A message sent to fans by the star - real name Stuart Goddard - read: "Ant fans - please send me postcards at the Chelsea & Westminster Hospital, Fulham Road. Please don`t come down here as it may upset the staff who have been really pleasant. I am having a well earned rest at Her Majesty`s Pleasure and am painting and continuing being an art student. I have a great view and am considering gigs later in the year."
According to an Adam & The Ants fansite, the singer was sectioned after an unspecified incident on 18.05.10.
The 55-year-old star stunned fans in Portsmouth, South East England, last week when he invited a four-year-old boy up on stage and began to teach him the words to The Who`s `My Generation`, before screaming obscenities at frustrated fans who tried to leave the show, singling out Christians, who he told to "f**k off".
In 2002, Adam hit the headlines when he threatened drinkers in a London bar with an imitation pistol, but escaped jail on mental health grounds.
He was sectioned in September 2003 after a dispute with a neighbour, where he threatened to smash in his doors with a shovel and was eventually found naked in a cafe basement.
Adam - who has been hospitalised several times - recently declared his intention to resume performing for the sake of his 12-year-old daughter Lily, insisting he had overcome his problems.
He said: "Lily has never seen Adam perform and doesn`t know what The Ants were all about.
"I`ve had this life-long battle against manic depression, but I`ve had to overcome it for her sake. Times got bad. I lost my mind. But I`m back."