Taylor Swift showed off two awesome new additions to her ever growing Swift Squad during her show at Levi's Stadium in Santa Clara on Saturday, Hollywood mega-star Julia Roberts and folk legend Joan Baez. The two joined Taylor on stage during the second of her back to back California concerts which also saw appearances from girlgroups Little Mix and Fifth Harmony.

Tonight Joan Baez and Julia Roberts danced it out to 'Style'. These two women are my heroes. What an honor.

A photo posted by Taylor Swift (@taylorswift) on

Swift brought Roberts and Baez onstage during her performance of ‘Style’ and the two showed off their dance moves beside the singer. Sharing some photos on twitter of herself and the two ladies Taylor wrote, ‘Tonight Joan Baez and Julia Roberts danced it out to 'Style'. These two women are my heroes. What an honor.’

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The night’s other surprise guests were British girl group Little Mix who performed their hit single ‘Black Magic’. ‘LITTLE MIX!! Love these girls!! They smashed it tonight in front of 50,000 screaming fans. Amazing,’ Swift wrote on twitter. Then writing on Instagram, Little Mix called Swift ‘a ledge’ and said it was an ‘incredible honour’ to join her onstage.

Little Mix smashed it in front of 50,000 screaming fans tonight! #1989tourSantaClara

A photo posted by Taylor Swift (@taylorswift) on

On Friday night another girl group, Fifth Harmony, joined Swift for a rendition of ‘Worth It’. After the gig Swift tweeted, ”I want to be in Fifth Harmony", while band member Dinah Jane Hansen wrote, ‘IT WAS HARD TO KEEP IT A SECRET. Ohhh mah gosh!! Tonight was AMAZEBALLZ!!’

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Swift has been joined by a host of stars during her 1989 world tour which has been running since May and is set to continue through to December. During her show at Met Life Stadium in July the singer was joined by the U.S. Women’s Soccer team as well as actress Lena Dunham and models Gigi Hadid and Hailee Steinfeld.