Taylor Swift Invites Some Famous Friends to Her 'Reputation' Secret Sessions in Los Angeles

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Jack Antonoff and Taylor Swift perform onstage during The 58th GRAMMY Awards at Staples Center on Feb. 15, 2016 in Los Angeles, California. 

Fans who were lucky enough to attend Taylor Swift's Reputation secret sessions in Los Angeles were in good company: frequent collaborator Jack Antonoff, as well as Alana Haim and Ruby Rose, apparently joined them at the exclusive listening party.

The "Gorgeous" singer has been inviting handpicked Swifties to attend super-secret gatherings with her in various cities. There, they get to preview her upcoming album -- which also features "Look What You Made Me Do" and "...Ready for It?" -- before it's released.

"Don’t judge the album yet guys there’s so much to it like if you think you have an idea you really....you don’t," one fan wrote on Twitter after the Oct. 22 event in L.A. "I’m so shook."

"I cannot believe I met Taylor Swift on the anniversary of Red," another said, referring to the album Swift released on Oct. 22, 2012.

Antonoff even chimed in, writing, "loved the people i met tonight. that's who the music is for."

Check out tweets about the L.A. secret sessions below.