Daily News & Analysis | Puff Diddy will join iHeartRadio Music Festival Daily News & Analysis Rapper Sean Combs, also known by his stage name Puff Diddy, has been added to the line-up for iHeartRadio Music Festival in Las Vegas. Puff Diddy Getty Images. Rapper Sean Combs, also known by his stage name Puff Diddy, has been added to the ... Diddy will join iHeartRadio Music Festival Sean 'Diddy' Combs -- aka Puff Daddy -- Added To iHeartRadio Music Festival Lineup Puff Daddy to join iHeartRadio Music Festival |