Rita Ora as Mia Grey
Rita Ora at the British Fashion Awards in London. The British singer was cast as Mia Grey in the "Fifty Shades of Grey" film. Reuters

News that native British pop star Rita Ora officially joined the cast of the “Fifty Shades of Grey” film resulted in uproar among a majority of the erotica series' fanbase on Tuesday night.

Following the announcement from Ora on Twitter that she had signed on to star as Mia Grey -- Christian Grey’s adopted younger sister -- fans took to social media to protest the decision to cast the 23-year-old singer who is best known for her hits “R.I.P." and “How We Do." “They’ve casting Rita Ora as Christian Grey’s sister in 50 Shades movie. I’m sorry but that’s ridiculous,” tweeted Shen Harvey on Wednesday. “CrazyFangirl” added, “Rita Ora. Mia Grey. Are you serious? #No.” Others questioned if the casting news was a hoax, with Danielle Joshua tweeting on Wednesday, “Please tell me it’s a joke that Rita Ora has been cast in Fifty Shades of Grey.”

Fans have also resorted to protesting on “Fifty Shades of Grey” author E.L. James’ Instagram page. The native British author, who in recent days has posted behind-the-scenes photos of the film’s Vancouver set, has since received a flood of complaints from devout fans. While “Fifty Shades” Wiki page doesn’t classify the race of the character of Mia Grey, only describing her as a “bubbly and outgoing” girl with “raven-colored hair,” fans claim that the Albanian-born singer's skin tone is wrong for the role.

“She is supposed to be Caucasian, raven color hair and tall,” commented Instagram user @smccown1968 on Wednesday. “I think they missed the boat on [Mia Grey].” Another Instagram user, allisonlejeune, added, “She is described as being an all American type. A white brunette. Rita Ora is pretty but she doesn’t fit the description.”

Despite a majority of fans protesting the casting announcement, others gladly welcomed Ora to the cast. “Congrats and glad to have you as part of the Fifty family,” @GgesyMota posted on Twitter. Another Twitter user @Life_Of_Rar shared, “They couldn’t have picked a more perfect person than @RitaOra to be in @FiftyShades.”

Ora is one of several “Fifty Shades of Grey” cast members to receive backlash for joining the much-anticipated film. Following an announcement in September that former sitcom actress Dakota Johnson was cast as lead Anastasia Steele and “Sons of Anarchy” TV actor Charlie Hunnam was cast as sadistic billionaire Christian Grey, fans protested with an online petition on the platform site Change.org. In October, Hunnam left the role, citing his “immersive filming schedule” with the FX program. He was replaced by “Once Upon a Time” actor Jamie Dornan. The film is expected to arrive in theaters in February 2015.