'American Idol' Winner Phillip Phillips -- Big Surgery Imminent

Newly-crowned "American Idol" champ Phillip Phillips will finally undergo urgent kidney surgery next week, TMZ has learned.

TMZ broke the story ... Phillips doctors ordered him to undergo a procedure to fix his severe kidney stone problems -- which have worsened since the singer went on "Idol" -- but Phillip refused, insisting on finishing the show first.

But now that it's all over ... and Phillip won ... we're told he's finally planning on getting the operation in L.A. in the next 7-10 days.

We're told Phillip's parents will be flying in for support.

Kidney operations are no joke -- Phillip can expect to spend several days in the hospital, followed by a 6-week recovery period.