Simon Cowell suit black Mr. Paparazzi

Simon Cowell was spotted leaving Cipriani in London last night, and the music mogul was in good spirits as he headed back to his car. It's not clear whether the X Factor creator will appear in Los Angeles today for auditions, but one thing's for sure -- we'll be watching the US version of the show when it premieres this September!

Nearly 18,000 people showed up to the LA Sports Arena today to try out for the show, and judging by that turnout, it seems like this reality competition could be even bigger than American Idol! Additional auditions will take place in Chicago, Miami, Seattle, Dallas and Newark, so if you missed your shot this weekend, you'll get another chance!