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Stevie Nicks is joining the cast of NBC's "The Voice."  The Fleetwood Mac frontwoman is on board for season seven, and will serve as an advisor to coach Adam Levine. 

Levine jokes to "Extra" that it took "bribery, begging, pleading" and "a lot of gifts" to get Nicks to sign on.  And Stevie takes things further, claiming it was the "presents" -- including a "fur coat, some beautiful shoes," and "sheets" -- that did the trick.  She then offers her real reasons for agreeing to participate, admitting she thinks "The Voice" is "great." 

Nicks adds that Adam's lengthy run is an endorsement in itself, because he wouldn't "still be sitting here seven years later if this wasn't a great show." 

Adam says he's also thrilled to have Stevie on his team because she's his "lucky charm." 

Nicks made a guest appearance on the season one finale of "The Voice" and sang "Landslide" with Team Adam's Javier Colon, who became the show's first winner. 

"The Voice" will return to NBC on September 22nd. 

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