X17 can report exclusively that producers at NBC's The Voice plan to axe Christina Aguilera as a coach on the show.

While Aguilera is under contract for season two, a source close to the show tells us bosses are not happy to be stuck with her and they plan on replacing her for season three. Said our source:

    "She doesn't spend time with her contestants like she's supposed to. She doesn't participate. She spends most of her time on the set with her boyfriend."

AND we hear she is doing some drinking on the job. But, our source tells us this is part of the on-set culture -- we're told Adam Levine and Blake Shelton frequently take shots while filming to loosen up.

Earlier this year, The Voice host Carson Daly said the show would succeed without its original coaches. "This show is bigger than any of its coaches or the host," he said. "This show will live on in perpetuity with many a star in those chairs."

A rep for NBC told X17, "There is absolutely no truth to the rumor."