Singer Miley Cyrus, known for her crazy antics, has posted two racy videos showing off her enlarged prosthetic buttocks on Instagram.

Cyrus is seen blow-drying her hair while singing, dancing and even twerking backstage in the video before her Bangerz tour date in Monterrey, Mexico Wednesday, reports dailymail.co.uk.

Along with the fake derriere, Cyrus wore a shimmering white top and thong, which really showed off the bodacious behind.

In one of the videos, she runs her fingers through her short, platinum hairs and said: 'I don't even need wigs b****es.'

Then she proceeds to gyrate her hips to bounce her fake behind up and down before walking through the curtain.