She seriously can't stop!

From smoking cigarettes to sitting in a window sill with her legs spread, Miley Cyrus is giving Rihanna a serious run for her money in the bad gal department.

The 20-year-old singer appears in the new music video for Mike Will Made It's song "23," and though we already heard the tune, it really comes to life when you see a scantily-clad Miley prancing around and rapping/singing along! Click the video above to check it out...