Taylor Swift Brings Out 'Heroes' Julia Roberts and Joan Baez In Latest Concert Surprise

Julia Roberts and Joan Baez joined Taylor Swift during her song "Style" at Levi's Stadium in Santa Clara, Calif. on Saturday, the latest surprises on Swift's 1989 tour.

Taylor wrote on Instagram: "Tonight Joan Baez and Julia Roberts danced it out to 'Style'. These two women are my heroes. What an honor."

I love Julia Roberts so much!

Also performing at the show was Little Mix from The X Factor UK.

What a night!

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 Aug 16, 2015 at 12:54am PDT

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

A photo posted by Taylor Swift (@taylorswift) on Aug 16, 2015 at 12:48am PDT