Katherine Jenkins and her pro partner Mark Ballas dropped to the bottom of the scoreboard on "Dancing with the Stars" semifinals Monday, a competition that was dominated by TV host Maria Menounos and Telenovela actor William Levy.

Each of the remaining four couples performed two individual ballroom routines on Monday.

Jenkins, a long time favorite, obtained the lowest total score of the night with 56 points forr her two routines. The outcome was the result of a back injury she suffered at the end of her last dance.

That dance "might have been the best dance I've ever seen on 'Dancing with the Stars" judge Carrie Ann Inaba told her.

Her dancing partner Ballas, was begging their fans to keep voting for them on Tuesday.

"Seriously guys we couldn't finish our dance. Katherine hurt her back, I tried my best not let her fall at the end :) hope we still have ur votes," he wrote on Twitter.

The top performers were Menounos and her dancing partner Derek Hough who ended with 59 out of 60 points. Levy and his pro partner Cheryl Burke ranked second with 58 points out of 60.

Both contestants earned perfect scores for their tango routines.

NFL player Donald Driver and his partner Peta Murgatroyd obtained a total of 57 points.

One couple will be eliminated tonight.

Check Out the Top 3 Best Performances of 'Dancing with the Stars' Semifinals:

William Levy's Tango Routine:

Maria Menounos Tango Routine:

Katherine Jenkins' Salsa:

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Dancing with the Stars