Rihanna*Rihanna has pulled out of her Victoria’s Secret Fashion Show performance, and a source tells PAGE SIX that the pop diva had to cancel her appearance to finish work on her album, “Anti.”

RIRi was planning to perform a brand-new song at the star-studded show, but she canceled Monday night, and organizers had to scramble to find a replacement one week before she was set to hit the stage at Manhattan’s 69th Regiment Armory.

“She’s still working on some stuff and [the music] isn’t to a point where she wants to perform it. Things are supposed to be further along, but she’s still not ready,” a source tell us.

But another insider said that wasn’t why she canceled. “She does have something to perform. But the album isn’t finished yet, and finishing it is the priority,” this source said. “She couldn’t take the time to rehearse and perform and finish the album. It just all didn’t come together.”

While Rihanna has performed at the show before, a different insider said this of her backing out of the 2015 event, “It is what it is. It hasn’t seemed that anyone is upset. It’s business as usual. They’re just relieved that everything is still moving and are thrilled Ellie was able to pick the ball up on such short notice. They’re pumped that she’s game.”

British singer Ellie Goulding will fill Rihanna’s slot, she joins previously announced performers Selena Gomez and The Weeknd. Organizers are relieved to have secured Ellie, however, “She’s no Rihanna,” the source says.

Supermodels and veteran VS Angels Adriana Lima, Alessandra Ambrosio, Behati Prinsloo, and Candice Swanepoel will all be gracing the catwalk, along with Lily Aldridge, who will be modeling this year’s $2 million Fantasy Bra, according to PEOPLE.

The Victoria’s Secret Fashion Show airs Dec. 8 at 10 p.m. on CBS.