Taylor Swift Concert, Little Mix

John Medina/LP5/Getty Images for TAS

Taylor Swift's squad keeps getting bigger and fiercer!

At her second concert in Santa Clara, California on Saturday, the 25-year-old pop star performed with British female pop group Little Mix and also welcomed onstage Julia Roberts, 47, and 74-year-old folk rock singer Joan Baez to walk and dance on the stage runway as she sang her hit "Style."

She joined Little Mix, made up off Perrie Edwards, 22, Jade Thirlwall, 22, Leigh-Anne Pinnock, 23, and Jesy Nelson, 24, in a joint performance of their song "Black Magic."

Their surprise appearance followed fellow female pop group Fifth Harmony's performance with Swift the night before. During her current 1989 tour, the singer has welcomed onstage a slew of celebrity friends, including fellow singers, actresses and models, many of whom star in her "Bad Blood" music video.

Taylor Swift Concert, Joan Baez, Julia Roberts

John Medina/LP5/Getty Images for TAS

"Little Mix smashed it in front of 50,000 screaming fans tonight! #1989tourSantaClara," Swift said on Instagram.

A photo posted by Taylor Swift (@taylorswift) on

"OMG cannot quite believe what's just happened, one of the best experiences in our little mix life ever!" the band said on their Instagram page. "Cannot thank Taylor enough for having us tonight, 60,000 incredible screaming swifties with a sprinkle of Black Magic, thank you for being so welcoming to us! We love you Taylor can't wait to catch up very soon! xx Little Mix xx"

"Love you loads and cannot wait to have a girly night soon!!," they added on Twitter.

Swift also posted a photo of herself with Roberts and Baez onstage, calling them her "heroes."

"What an honor," Swift said.

A photo posted by Taylor Swift (@taylorswift) on

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