Holly Madison, Melissa Rycroft join `Dancing' (AP)

on Monday's season premiere. Madison, a star of "The Girls Next Door" and four-time Playboy cover model, replaced Jewel, who suffered fractures in both legs during pre-show training. Madison spent five days rehearsing with the singer's professional partner, Dmitry Chaplin .

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, began rehearsing Saturday. Though Tom Bergeron noted that she was "the performer with the least amount of training in the history of the show," Rycroft's past dance experience helped her and professional partner Tony Dovolani earn 23 points for their waltz. "The two days we put in, it feels like it paid off," she said after her performance.

Full Story: Holly Madison, Melissa Rycroft join `Dancing' (AP)