"The X Factor" judge and creator joined social-networking site Twitter on Wednesday, under the handle @simoncowell. He sent out his first and so far only tweet Wednesday afternoon, which included a shout-out to his Fox singing competition airing that night.
Jay-Z has been added to the Clear Channel's inaugural iHeartRadio Music Festival line-up hosted by Ryan Seacrest. The rap star will close out the opening night of the two-day fest at the MGM Grand in Las Vegas. Other scheduled performers include Lady Gaga, Coldplay, Steven Tyler, Kenny Chesney and Jennifer Lopez.
Police donned riot gear to calm down an unruly mob in Hollywood at the world premiere of "Electric Daisy Carnival Experience -- a documentary about the notorious electronic music festival -- on Wednesday night.