The X Factor continued their new Four Chair Challenge on Thursday for the 10 contestants in mentor Demi Lovato's Girls category.

After Lovato's top 10 acts performed, she eliminated six and revealed her top four favorites to coach for season 3.

During the process, Lovato faced several challenges. She was forced to make swaps and eliminated singers she had previously expressed were her favorites. Several contestants surprised the Glee guest actress and performed better than previous weeks.

Lovato's choices for the final four contestants for the upcoming live shows are Rion Paige, Khaya Cohen, Danielle Geimer, and Ellona Santiago.

Lovato's eliminated GIRLS acts are:

Bree Randall

Simone Torres

Rylie Brown

Primrose Martin

Ashly Williams

Jamie Pineda

'The X Factor' USA 2013 Season 3: Final Over 25 Contestants Picked After First Four-Chair Challenge (VIDEO) 

The Four Chair Challenge was introduced on Wednesday. Host Mario Lopez explained that after the 10 remaining acts of each category performed "their mentor must decide whether or not to give them a seat or send them straight home."

"Nobody will be safe until the end," Cowell warned.

Kelly Rowland's Over 25 acts performed that night. 6 were eliminated and the top 4 were announced.

Cowell will continue to mentor the groups category, to victory and Paulina Rubio will mentor the boys.

'The X Factor USA' 2013 Season 3 Top 40: Demi Lovato, Kelly Rowland, Simon Cowell & Paulina Rubio Teams Revealed (VIDEOS) 

The Four Chair Challenge will air over the next two weeks. The X Factor season 3 airs on Wednesday & Thursdays at 8 p.m. EST on FOX.

The X Factor, however, will not air on Oct. 23 due to a one-week hiatus for a professional baseball game that will air live that week. The season's live shows will then resume on Oct. 30.