"Nick is pretty close to signing to be the Idol judge," a source told Us. "They flew him in to L.A. last week for final meetings."
The 19-year-old "Who I Am" singer is reportedly under consideration because he's available after wrapping up his four-month commitment to Broadway's How to Succeed in Business Without Really Trying show and, according to another source, "[Idol producers] think he can help bring that younger demo to the show."
Williams, a 39-year-old rapper and successful music producer, may also be on his way to inking a contract with American Idol after producing hit albums for stars such as Britney Spears and Gwen Stefani.
"Everything is looking good, but they're still working out details," a third source told Us in reference to Williams' involvement.
A Fox representative reportedly declined comment on the matter.