The Top 4 girls kicked off last night's 'American Idol' show with a group performance of Beyonce's 'Crazy In Love.' There's no easy way to say this to fellow 'Idol' Top 4 fans: it was horrible. It was an odd mix of something you'd see on 'Glee' combined with an Alvin and The Chipmunks remix.

In any case, the ladies became only three when one of the most beautiful and talented ladies were sent home.

Some big-name stars graced the 'American Idol' as well to perform their new singles including, will.i.am Harry Connick Jr., -- who gave the girls some much needed advice -- and David Cook, who was an 'Idol' Season 7 winner and multi-platinum rock 'n' roll artist.

Will.i.am came through and showed the girls how to put on a show with a memorable performance of his jazzy, big-band, new single 'Bang, Bang.' To say it was visually spectacular would be an understatement. The stage lighting initially made the entire scene look like a black-and-white old school film and the coordinated band moved in time with the Black Eyed Peas frontman -- totally cool.

The episode ended with a difficult elimination. Amber Holcomb was sent home after landing in the Bottom 2 last week -- she didn't receive enough combined votes to stay in the competition. She was joined by Kree Harrison in the Bottom 2 this week.

In a very emotional moment, she sang her very last song on 'Idol.' Her father took to the stage to comfort the crying and disappointed contestant while the remaining female contestants watched on in tears. Did Mariah Carey cry? Well, of course she did.

Watch the Top 4 Ladies Sing Beyonce's 'Crazy in Love' on 'American Idol'