Bristol Palin proved defiant when she returned to "Dancing With The Stars" rehearsals just a day after mail room staff discovered a letter filled with white powder addressed to dancing star.

The 20-year-old smiled for cameras yesterday as she made her way into the Hollywood dance studios dressed in grey leggings and a black hooded sweater.

Sarah Palin's daughter is preparing to compete in tonight's final with her partner Mark Ballas. Fans of the dancing show were outraged last week when singer Brandy was ousted from the show, despite receiving consistently higher scores from the judges than Palin.

Staff in the mail room of CBS studios in Los Angeles were on high alert Friday night after discovering the white substance in a piece of hate mail addressed to Palin.

“Security and the Los Angeles Fire Department and Los Angeles Police Department were immediately notified,” a spokesman for television network ABC said at the time.

“Measures were taken to secure the area and ensure the safety of personnel. Ultimately we were advised by the LAFD that the substance was determined to be talcum powder.”

Despite the nasty mail, Palin has remained upbeat and paid tribute to her fans over the weekend.

“Thank you supporters who continue to support,” she wrote on her Facebook page