Simon Cowell and Demi Lovato have both been confirmed by Fox to be returning to The X Factor, but two judges' slots remain open due to Britney Spears and LA Reid leaving the show.
Cowell is apparently in talks with several celebrities to join the judging panel, but an insider told Us Magazine that Hewitt is one of the frontrunners.
"Simon is very interested [in Jennifer]," the informant revealed.
Hewitt is primarily known for her acting work, but has notably released four albums.
Reba McEntire is also apparently under consideration, with Destiny's Child star Kelly Rowland rumoured to be in serious talks to join the show as well.
A representative for The X Factor responded to the various judging rumours by describing them as "pure speculation".
The X Factor USA returns to Fox in the fall.