Although Aguilera has previously collaborated with a string of rappers including Lil' Kim, Mya, Diddy, Pitbull, Missy Elliott and Redman, she described Liberation
as being her most hip-hop inspired work yet.
"To me, there's nothing like an amazing hip-hop beat," she said. "At the end of the day, I am a soul singer. When you strip back the words 'pop star' and the many things that I've done, singing soulfully is where my core, my root and my heart really is. And as you can see, it's what I'm inspired by."