Landon Asher Barker, Travis Barker’s son, joined Machine Gun Kelly onstage at Madison Square Garden in New York City on Tuesday night, hours after his father was reportedly hospitalized for an unknown health issue. The two sang their collaboration "Die in California" in front of a sold-out crowd. Barker, 18, shared several Instagram videos on his story of his New York performance but made no mention of his dad's reported hospitalization.