And, as if to emphasize the point that she is no longer a child star, the singer even stroked the R&B crooner’s crotch with an oversized foam finger.
Wearing a tiny bodice the former child sang her hit We Can’t Stop.
The bizarre performance took place on a stage crammed with people dressed as teddy bears.
During the more than six-minute long set the 20-year-old slapped another woman’s curvy butt and skipped along the stage only stopping to shake her rear at the screaming audience in the mosh pit.
Then she whipped off her furry teddy to reveal a beige-colored bra and panties before Thicke joined her on stage.
The R&B singer didn’t seem to notice Cyrus’s off-key rendition of his hit song Blurred Lines.
Not content with grinding on Thicke, Cyrus used the foam finger to stroke herself in between her own legs as well thrust her pelvis at the audience.
Thicke clearly enjoyed the performance. He tweeted later: “That was dope. Shout out to @MileyCyrus…”