Taylor Swift Celebrates 32nd Birthday With Alana Haim [Photos]

Taylor Swift hosted a birthday bash Monday with bestie Alana Haim as the duo danced to the tune of a fan-favorite song from her album "Red."

The singer took to her Twitter page and shared two snaps from the joint birthday event. She wrote, "Don't say it, don't say it OKAY I'm saying it: I'M FEELIN 32. And Alana is feeling 30. Don't worry we tested everyone! Thank you so much for the birthday wishes, I love you all so much."

In the first photo, Swift is seen dancing with Haim as friends cheer them on. In the next photo, the pair is seen staring happily at two matching birthday cakes.

The "Shake It Off" singer has been friends with Alana – the youngest member of the pop-rock group Haim, for years. Their friendship began in the summer of 2015 when Haim opened for Swift on her "The 1989 World Tour." Swift, Alana and the other Haim sisters – Danielle and Este – went on a vacation in Hawaii the same year.

The candid shot on Swift's Twitter post also shows "Booksmart" actress Diana Silvers and singer Gracie Abrams partying with Swift and Haim.

Abrams also took to her Instagram page to share a group selfie with Swift and Silvers and captioned it, "Happy birthday king of my heart body and soul ooo oh @taylorswift."

While Swift's "Red (Taylor's Version)" is still maintaining its strong grip at No. 2 on this week's Billboard 200.

Meanwhile, the singer has been ordered to go to trial to defend "Shake It Off," which is facing copyright issues from songwriters of 3LW's 2001 single, "Playas Gon' Play."

U.S. District Judge Michael W. Fitzgerald ruled last week that Swift must face trial over allegations of stolen lyrics.

While there are "some noticeable differences" between "Shake It Off" and "Playas Gon' Play," they have "enough objective similarities" that merit a jury trial, the judge said, adding that Swift had made some "persuasive arguments" against the case, but it was not enough for the court to drop the accusations against her.

Alana's acting performance in her latest film, "Licorice Pizza," has received glowing reviews, with New York Post saying, "Haim takes her character's depressing life and makes it lovable, relatable and human."