The routine sparked backlash from critics who felt it was a poor choice for the then-16-year-old "Hannah Montana" star.
The 24-year-old singer is rumored to have dated the 54-year-old actor before Purcell married her mother, Tish Cyrus.
She opened up about her marijuana use in the 'Sorry I'm Stoned' podcast, which she co-hosts with daughter Brandi.
Tish Cyrus and the 'Prison Break' actor made their relationship Instagram official back in November.
