AceShowbiz -

Chris Brown hits back at his neighbors who have been complaining of the mural he painted outside his four-story home in Beverly Hills. The R&B singer is ordered to remove the graffiti within 30 days, but he stands his ground.

Calling it an expression of art, he furiously tweeted, "Keep em inside then! It's art. There are scarier creatures on Harry potter. Get a f**king life!" He added, " 'Lords of dogtown' is how I live my life. #Free ima paint until my hands fall off."

In an unrelated post later, the 24-year-old artist wished his mother a happy Mother's Day, "I wanna praise the woman who created me! 'Momma Joyce' happy Mother's Day . Thank u for always letting me be creative and dream!Love you mom."

The mural in question depicts sharp-toothed, large-eyed ghostly creatures. People living next door to Chris claim the monster painting frightened local children. Also, under city ordinances, it's illegal to create murals on most private properties. He's fined $376.

"I know a $300 fine is probably pocket change. But hopefully and maybe, he'll just see the light and decide to be a good neighbor," said Patti Negri, president of the Hollywood Dell Civic Association. "We're happy to have him - if he just tones it down."