Model/D.J./blonde Theodora Richards, the daughter of legendary Rolling Stones guitarist Keith Richards, was busted by cops yesterday for an act of graffiti — with bubble paint. She was arrested in the act of writing, in letters no bigger than a quarter, “T (heart) A.” (Her sister is named Alexandra.) Of course, the surface on which she was scrawling was the wall of a convent, in Soho, so that’s not so great. And also, it turned out Theodora’s purse was full of marijuana and hydrocodone for which she didn’t have a prescription. But still! Bubble paint!