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Chris Brown showed off his new neck tattoo at Supperclub, and he was in such a good mood last night, he even gave photographers a shot of his signature crotch grab!

Despite initial speculation that the ink was of ex-girlfriend Rihanna (or a battered woman), the 23-year-old "Don't Wake Me Up" singer set the record straight on Twitter yesterday. "I'm an artist and this is art. Dia de los Muertos," he wrote. The ink appears to be a sugar skull, an image associated with the November 1 holiday, and his rep tells TMZ that the tat was also inspired by "a MAC cosmetics design he saw."

Glad he's so happy lately ... it looks like his chair throwing days are behind him!