Los Angeles and Seattle are the sites for the rounds of auditions.

The Top 20 dancers hit the stage for their first chance to compete.

Two of the top 20 dancers are eliminated from the competition. Rapper Sean Kingston performs.

The remaining 18 dancers hit the stage again for this week's performances.

The final 18 dancers will be cut down to 16 at the end of the evening.

The top 16 dancers perform.

Two of the top 16 dancers are eliminated from the competition.

The top 14 dancers perform.

Two more of the remaining 14 dancers are voted off the show. A pas de deux is performed by dancers Desmond Richardson and Patricia Hachey.

The top 12 dancers perform.

Two more of the remaining 12 dancers are voted off the show. Singers Kelly Rowland and David Guetta perform.

The top 10 dancers perform.

The final 10 dancers await the elimination of 2 more contestants. Plus, a performance by the Black Eyed Peas.

The remaining eight dancers will be paired with new partners for this week's performances. Guest Judges include comedian and talk-show host Ellen DeGeneres and Emmy Award-winning choreographer Mia Michaels.

In the series 100th episode, Season 2 contestants Travis Wall and Heidi Groskreutz dance to a pair of Wade Robson's routines, and Season 3's Jaimie Goodwin and Hok Konishi perform Mia Michael's "The Bench." Lastly, 2 of the final 8 dancers are eliminated.

This two-hour season finale will air live from the Kodak Theatre in Hollywood, California. From the Top 4, America's Favorite Dancer will be revealed.