Smart seemed to falsely assume Fox had already made the announcement of Lopez's Idol participation and therefore accidentally disclosed the news while discussing his new show entitled A Step Away on nuvoTV.
Reports that Lopez, who served as a judge on Idol's tenth and eleventh seasons, was "very close" to signing a deal to return to American Idol emerged earlier this month.
"Both Fox and Jennifer are very happy about this and want it to happen very much," a source close to Lopez told People at the time.
Fox Entertainment chairman Kevin Reilly simultaneously had also confirmed the network had been in talks with Lopez as part of his announcement Keith Urbanwill be coming back as a judge.
Besides Urban, Reilly had stressed no other deals were in place yet.
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