The 26-year-old country singer won the show's mirrorball trophy Tuesday.
Pickler and her professional partner, Derek Hough, earned two sets of perfect scores Monday night and another on Tuesday. Judges' scores combined with viewer votes determine the winner.
Because there were problems Monday with voting on the ABC website during the show's East Coast broadcast, host Tom Bergeron said Tuesday those votes weren't counted. Only votes cast by phone, text and Facebook factored into the final count.
Teen Disney Channel star Zendaya came in second place. Football pro Jacoby Jones finished third. Fellow finalist Alexandra Raisman was axed at the beginning of Tuesday's episode.