"Glam" is expected to be the lead single from the album, according to an interview with Marie Claire. The song has been written by Aguilera and Claude Kelly and produced by Tricky Stewart. "Glam" is described as "a poppy hip-hop inflected throwback to Madonna's Vogue.According to Wikipedia
The song is expected to hit radio airwaves on February 16, 2010.
Rumor Mill: Wikipedia