Joan Baez GIFs Archives

The surprise guests on Taylor Swift's 1989 World Tour just keep getting better.

On Saturday night in Santa Clara, the 25-year-old thrilled the audience by bringing out her two 'heroes' - iconic actress Julia Roberts and legendary singer Joan Baez.

The two stars both showed their love of Taylor in her tour T-shirts, as they linked arms with her and strutted along the catwalk to Style.