Keith Richards' fashion model daughter was arraigned yesterday on graffiti and drug possession charges after she was busted Tuesday night tagging a SoHo convent, officials said.

Theodora Richards, 25, was caught by police around 10:40 p.m. writing "T [heart] A" on the side of St. Anthony's Convent at 190 Prince St. The arresting officer found marijuana and eight and a half hydrocodone pills in Richards' purse, the criminal complaint said.

"I hope I don't get in trouble for this," the 5-foot-7 blonde told the cop, according to the complaint. "I don't have a prescription for them."

Richards was charged with making graffiti, possession of a graffiti tool, criminal possession of a controlled substance and marijuana possession. She was released without bail.

Her attorney, Stacey Richman, told amNewYork she rejected a "non-criminal" plea deal from prosecutors yesterday, and that Richards is "an elegant woman from a very distinguished family, and she's doing fine."

She faces up to a year behind bars. Her next court date is April 21.

A woman who answered the phone at St. Anthony's said the convent had no comment, but a nun there told the Post "of course" she was upset by the graffiti.

"It's defiling private property and it's convent," she said. "We'll have to ask the city to take it off, the taxpayer money now has to pay for this."

Richards' father sang a song with the Rolling Stones called "Little T&A," but it was unknown whether that's what she was referring to.