'Dancing With The Stars' 2015 update: Judges coach four remaining couples in semifinals

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"Dancing with the Stars" season 20 is now down to the final four competitors fighting and dancing for the coveted Mirror Ball Trophy. The widely popular dance competition is on its semifinals and the couples will be performing twice. Also, each of the pairs will get one judge as coach for their first performance.

Len Goodman will coach Nastia Liukin and Derek Hough (or Sasha Farber). This should be a strong follow up to "the most innovative Trio Dance" they performed last week. 

On the other hand, Riker Lynch and pro dance partner Allison Holker will get some help from Julianne Hough for their contemporary routine. The pair has been on a roll this season and there's confidence that they will do a flawless job on this week's performance. 

Meanwhile, judge Bruno Tonioli will be of help to Rumer Willis and Val Chmerkovskiy for their Argentine Tango. Buddy TV believes this will be an easy perfect score for the pair. The latter is an expert on their assigned routine. 

Carrie Ann Inaba will teach Noah Galloway and Sharna Burgess some moves for a flawless Viennese Waltz. Last week's contemporary performance was believed by ABC to be their "most moving" presentation yet. 

One couple will pack their bags and leave the competition on Tuesday. But before that, viewers will get to gawk at an American performance choreographed by Mandy Moore in honor of the service and the valor of the women of the U.S. military. There will also be a jazz performance to the tune of "Gotta Be Me," a single from the Disney Channel Original Movie "Teen Beach 2," which stars Riker's brother, Ross Lynch. Also, Flo Rida will perform during the elimination night. 

The semifinals of "Dancing with the Stars" season 20 will air on May 11. Eliminations will air on May 12. 

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