The recent "Stand Up to Cancer" event included singer Ariana Grande in their list of performers and the executive producer have nothing but high praises to the star.

This report has come days after claims that Grande was a "total nightmare" after the show. The rumors surfaced allegedly came from witnesses backstage.

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The news was originally made public by U.K's Daily Star. Joel Gallen, the executive producer of the show said that the story run by the said news site was completely false. He added that Grande was wonderful to work with and that she was very gracious. He added that the singer was a flawless professional performer to both their team and to everyone who was at the Stand Up to Cancer program.

Gallen also pointed out the singer's performance of "My Everything". He said that the song she sang in honor of her grandfather, who was also a cancer patient, was one of the most moving moments in the entire show. He noted that they were honored to have her perform for them.

Grande's grandfather passed away on July 22. Grande has been very open about what she felt regarding the tragic loss.

Grande also tweeted before her performance saying, "Supporting a cause that is near & dear to my heart. Tonight I'm singing for grandps! I miss u."

Other performers include Dave Matthews, the Who, Lupe Fiasco, Common, and Jennifer Hudson.

Also, stars who were there to support the cause included Katie Couric, Gwyneth Paltrow, Reese Witherspoon, Joe Manganiello, and Jon Hamm.

The event was held at the Dolby Theatre in Hollywood and aired on different networks. As of today, there was reportedly over US$261 million in pledges by viewers in support of cancer research programs in search for a cure for the disease.

TagsAriana Grande, My Everything, Stand Up to Cancer, Diva, Executive Producer, not a diva, great to work with