Christina Aguilera may have one of the biggest voices in pop music, but even she feels there’s always room for improvement. The pop diva has reportedly hired celebrated vocal coach Seth Riggs to help prep her for a post-Bionic album.

Riggs, whose previous clients include Michael Jackson, Ray Charles and Josh Groban, is working with Aguilera so that she won’t “over-sing in the way that she has been criticized on her previous albums” and can “hit higher and lower notes.”

In addition, William Orbit, who’s currently polishing Madonna’s forthcoming LP, will produce Aguilera’s new record. Its release date hasn’t yet been announced, but fans won’t have to wait long to see the ‘Moves Like Jagger’ singer — it’s been confirmed that she’ll return as a coach on NBC’s hit series ‘The Voice‘ when it returns for a second season in February.

[PopCrush]