Selena Gomez is about to keep on dancing like she's 21  but Taylor Swift doesn't want Justin Bieber to be part of the upcoming festivities.

Selena  who turned 21 on July 22  will be ringing in the momentous occasion with a birthday bash on July 27, and her bestie Taylor will be none too pleased if Justin attends, according to Hollywood Life.

"Taylor was talking about how she’ll be on a super tight schedule on Saturday night because she has a show and she wants to get to Selena’s birthday party," a source reveals. "She was talking about flying out right after her show."

"She’s not going to want to be there if Justin is there  it’s so awkward between them now  so my guess is Justin’s not going to Selena’s birthday party," the source adds.

Taylor has made it quite clear over the past year or so that she is not on Team Justin, as she has wanted Selena to meet someone new. So this report about Selena's birthday isn't a major surprise.

Selena and Justin were rumored to have rekindled things on the 4th of July, but she called herself single as of last week, so perhaps she and Justin are back to off mode.

Is Justin ready to come and get some lovin' birthday cake at Selena's party? We shall see!

Source: Hollywood Life