Stern Jennifer Lopez looks ready for business as she arrives for American Idol

By DAILY MAIL REPORTER Ready for business: Jennifer Lopez wore a stern expression as she turned up to work as a judge on American Idol in the Pasadena area of Los Angeles yesterdayShe's there to judge the singing talents of fans eager to follow in her footsteps. But any American Idol hopefuls expecting an easy ride from Jennifer Lopez look set to be disappointed.The singer turned up for auditions