Selena Gomez has unfollowed Taylor Swift on Instagram, Hollywood Life reports, bringing their fight over Justin Bieber to another level of tension.

Taylor Swift is getting "payback" after seeing photos of her friend Selena Gomez with a new group of friends during Coachella, which must have been "hurtful" to the Red songs lyrics producer, Hollywood Life also reports.

The country singer gave her former best friend an ultimatum after finding out she was dating Justin Bieber again.

"Selena feels like [Taylor]'s not as good a friend as she thought, if ending their friendship was so easy for Taylor," an insider source told the site.

"She thinks the way Taylor is dealing with it is very petty."

Lena Dunham paid a visit to Taylor Swift on Tuesday, carrying several bags and a script, leaving many fans wondering if they are working on new songs and collaborating lyrics.

Taylor Swift has an "ultra-picky list of demands for a new boyfriend," a source told Hollywood Life earlier this week, sparking controversy among the Red album lyrics producer's fans.

The source told the site Jake Gyllenhaal's ex-girlfriend  "wants someone on her level when it comes to their career, plus, they have to be hot - like leading man hot. And she would love a guy that can speak at least two languages."

They also added she "wants a guy that has at least one sister because she thinks it will make him a better boyfriend. He has to have a good relationship with his parents, especially his mom, but he can't be a mama's boy."

Taylor Swift surprised an unsuspecting bride-to-be during her pre-wedding celebration in Ohio on Sunday, the New York Daily News reports.