One of the celebrities on season 18 of Dancing With The Stars suffered a serious injury during rehearsals this week.

Actress Danica McKellar Tweeted Friday, "So...I broke a rib in yesterday's rehearsal. Trying my best to pull thru and could use your prayers!! ."

McKellar and professional partner Val Chmerkovskiy are currently listed as the third couple on the leader board.  They received a 36 out of 40 for their Cha Cha to Whitney Houston's "I Wanna Dance With Somebody" Monday night.

Comedian Drew Carey and partner Cheryl Burke were sent home.

There are seven celebrities left competing for the mirror ball trophy.