Jennifer Lopez had a camera crew following her as she arrived at American Idol's LA studios yesterday. She joined fellow judges Steven Tyler and Randy Jackson for the second grueling day in a row of auditions for Hollywood Week. The trio are focused on narrowing down the field of hopefuls to 12 finalists while producers come up with more exciting twists for the show's 10th season. Three big changes have already been made to the format, and now contestants might be allowed to tweet during competition. Jennifer herself leaked a hint about the rule change last week, also promising to write to her followers on a more regular basis.