Who woulda guessed these two guys were Posty fans?! Former One Direction boybander Niall Horan donned a New York Yankees cap, blue jacket and blue pinstriped pants for the Post Malone concert at The Forum in Inglewood Thursday night. The 26-year-old Irish singer was joined by iconic 80s rocker Billy Idol and his girlfriend and Mr. Chow heiress, China Chow.