Barry Keoghan is Sabrina Carpenter's biggest fan.

Weeks after he Saltburn actor and "Feather" singer went public with their romance, he was seen watching her perform March 3 at Singapore's National Stadium as the opening act on Taylor Swift Eras tour. A fan video posted on social media showed Barry watching Sabrina on stage while covering his mouth with his VIP lanyard and clapping as she sang her latest improvised outro to "Nonsense," her last song on her setlist, which contained some suggestive lyrics.