Justin Bieber Hilariously Hijacks James Corden's Opening Monologue

Justin Bieber stopped by The Late Late Show on Thursday and ended up overstaying his welcome when he hilariously took over host James Corden's opening monologue. After bandleader Reggie Watts introduced James, Justin, who showed off his abs in Miami this week, was the one who came out behind the curtain. He then went right into delivering James's funny jokes, which included playful jabs at President Barack Obama, Hillary Clinton, and Yahoo! CEO Marissa Mayer. Watch the funny video above to see what happens when James realizes what's happening, and then check out Justin's new neck tattoo.