VIDEO: Amber Riley Wows the Judges with the Tango on DANCING WITH THE STARS

It was another tough week for Glee star Amber Riley who had to sit on the sideline for a portion of the rehearsal period due to problems with her knees. "I don't really want to disappoint anybody," said a tearful Riley prior to the performance. "I just want to do my best."

Following a strong performance of the Tango with her pro dance partner Derek Hough, judge Carrie Ann shouted, "Miss Amber Riley you are in fine form tonight," adding, "You worked on your footwork and it was so crisp and clean"

"Holy cow!" exclaimed this week's guest judge Julianne Hough. "You were like a tight little explosion - you were wonderful!"

"No beating about the bush," said Bruno. "That was pure, unmistaken, classical Tango."

The couple received a 27 out of 30. Watch their performance below!

"Dancing with the Stars" is back with an all-new cast and fresh show format. The competition will shake things up this season by transitioning to a one night, two-hour format. The premiere episode will kick off with a spectacular opening number featuring the entire cast. Each couple will then perform a Cha Cha, Foxtrot or Contemporary routine, vying for America's vote for the first time. Beginning with the second episode on Monday, September 23, one couple will be eliminated at the end of the show by combining the judges' scores from the first two weeks with the public votes from the previous week.

Hosted by Emmy Award-winning host Tom Bergeron ("America's Funniest Home Videos") and Brooke Burke-Charvet ("Dancing with the Stars" Season 7 Champion), "Dancing with the Stars" is the hit series in which celebrities perform choreographed dance routines which are judged by renowned ballroom judge Len Goodman and dancer/choreographers Bruno Tonioli and Carrie Ann Inaba

VIDEO: Amber Riley Wows the Judges with the Tango on DANCING WITH THE STARS