"Yeah!" yelled Osmond after host Tom Bergeron revealed he was the ninth-season celebrity winner based on the combination of the judges' score shares for the dancers' Monday and Tuesday night performances and the share of home viewer votes cast immediately after Monday night's broadcast.
Osmond's victory marks the first time in four seasons that a male has taken home the mirror ball trophy -- as Shawn Johnson won last spring's eighth season, Brooke Burke won last fall's seventh season and Kristi Yamaguchi won the Spring 2008 sixth season. Prior to that, a male had claimed four consecutive titles.
Singer Mya and her professional partner Dmitry Chaplin -- -- who topped the judges' leaderboard for six of the competition's 10 weeks -- finished second.
"We are so happy to come this far," Mya said after Osmond was revealed as the winner. "I had a broken foot last year. I'm just so happy to have made it to the finals and it's all about teamwork and we enjoyed ourselves. We had the time of our life."
"It's been the most beautiful, amazing experience," said Osbourne after the studio audience chanted "Kelly!" when her ouster was revealed.
"The only thing I really want to say in thank you America. Thank you so much for voting me in every week. It's because of you I've grown so much. It's because of you that I have this opportunity, so thank you from the bottom of my heart."
Osmond and Johnson had received a combined score of 85 out of 90 possible points for their three Monday night routines -- placing them in second behind Mya and Chaplin, who had scored an 87. Osbourne and van Amstel had finished third with 76 points.
All three couples then performed their favorite ninth-season routine during last night's live finale -- with their scores contributing to their final combined judges score total but not being voted on by home viewers who had already voted based on Monday night's performances.
The final performances were scored using with the same format as Monday night's "megamix" round, with Osmond and Johnson placing first and scoring 30 points, followed by Mya and Chaplin in second with 28 points and Osbourne and van Amstel in third with 26 points.
Last night's victory represented the first for Johnson on the U.S. version of the show, as she won Australia's Dancing with the Stars second season in Spring 2005 with TV personality Tom Williams.