Tonight was the final night of The X Factor USA's Four Chair Challenge and finally the Top 16 finalist have been completed.

After five weeks of auditions and even more auditions (who would've thought the four chair challenge would be another sort of audition?), finally the finalists are down to 16 - four for each category.

Over the past two weeks, all three judges completed their own list of four artists that will be competing in the live shows. Kelly Rowland and Demi Lovato completed the Over 25s and the Girls category last week, and yesterday Paulina Rubio completed her top four Boys. Tonight, Simon Cowell completed his own list of the top four Groups in the competition, and it sure looked easy for Mr. Cowell.

Yesterday's Four Chair Challenge saw Simon sending all four groups into the chairs without problems, but the judge revealed tonight that he was a bit too easy on the teams. "I think I was partly drunk last night...but I'm sober now," he joked, adding that it would be a more serious night for him.

First off on stage tonight was Sweet Suspense. Singing "Wishing On A Star", the group wowed the judges, with Paulina even noting that the ladies looked like "superstars." Simon also enjoyed their performance enough to send the group to the seats. However, with all four seats taken, Cowell had to switch out Wild Things, sending the group home.

Next up was Yellow House Canyon. The duo's performance wasn't enough to keep them in the show, and Simon had to send the two Texans packing.

Forever In Your Mind, a group brought together by the judges, sang Jonas Brothers' "Love Bug." While the judges didn't seem to be sold out for the boys, with Kelly saying that the "cuteness outweighed everything else" and Demi noting that it was the wrong song choice, Simon still kept the teens. Forever In Your Mind was switched with seat holder Glamour.

Good News, who sang "Landslide" also fell short tonight. Paulina noted that the ladies don't seem to be ready yet for the competition. It also seemed to be the easiest decision for Cowell of the night, as he sends the duo packing home.

Couple's Alex and Sierra performed yet another unique rendition of hit, this time it's "You're The One That I Want" from Grease. The two were sold out that all three lady judges wanted them to stay; however, Demi noted that from a "business standpoint" the two could break up eventually. Not with-standing this idea, Simon kept the duo and switched out Girls United instead.

Last on the list of groups for tonight was Roxxy Montana. The sisters sang "Man In the Mirror" that impressed all judges. Needless to say, Simon kept the group and had to say goodbye to Forever In Your Mind.

The only group that kept their seats from yesterday's episode is Restless Road.

With the Final 16 finally completed, the live shows will start on October 29. The X Factor USA airs every week, Wednesday and Thursday 8 p.m.ET on Fox.