Chris Brown is keeping the energy high on his Breezy Bowl XX Tour, which celebrates the 20-year anniversary of his debut album. During his September 20 stop at Allegiant Stadium in Las Vegas, Brown surprised fans by bringing out Summer Walker, who has been opening for most of the U.S. leg of the tour. The crowd erupted when Brown performed his hit track “Take You Down” and treated Walker to one of his signature sultry dance routines mid-performance. The intimate moment left Walker visibly flustered, and shortly after the show, she took to her Instagram Stories to explain why. Summer confirmed that she was nervous because Chris Brown has been her celebrity crush for years, making the already steamy performance even more memorable for both the singer and the audience.