Sabrina Carpenter surprised her fans at Austin City Limits when she brought out The Chicks during her set. The crowd went wild as the country legends joined her on stage for a duet of “Wide Open Spaces.”

Sabrina grinned the whole time, clearly thrilled to share the stage with them. Then The Chicks stuck around to sing on “Please Please Please,” giving the pop hit a country twist that had everyone singing along.

It was an unexpected mix of old and new that was easily one of the biggest moments of the festival.