In a shocking upset, underdog Kris Allen has knocked off the big favorite to win this season's American Idol, Adam Lambert. 

"Adam deserves this," the very humble newly crowned Idol from Arkansas said.  He could hardly hold back the tears.

At one point just a few weeks ago, Allen was a double digit underdog with the payout $1200 for every $100 bet at Sportsinteraction.com.  Heading into Tuesday night's show, Allen was still the underdog, paying $200 for every $100 bet.

"It's going to be a really tight race," says Chris Costigan, president of Gambling 911.com, in an interview with the New York Post.  He added that Danny Gokey's fans were most likely to vote for Kris now.  And that appears to have occurred. 

Deborah Starr Seible of the Post wrote that Allen, 23, has been quietly sneaking up the leader board. He has been impressive playing guitar and keyboards, most notably during his original acoustic rendition of Donna Summer's "She Works Hard For The Money."

"There are some unbelievable singers every year, like [David] Archuleta and Lambert, who start at the top and stay there," says "Idol" associate musical director, Michael Orland. "Then there are the ones that come out of nowhere, like Kris Allen.

One hundred million votes were cast on this season's American Idol finale. 

Jordan Bach, Gambling911.com