Vegas, London and the Bible. It’s the answer to the question of how Prince plans to spend the bulk of 2007.He will perform 21 shows in London at the O2 Arena beginning Aug. 1. He has spent most of the year performing Fridays and Saturdays in Las Vegas at the 3121 Club in the Rio hotel, which will continue through the rest of the year. Beyond a show booked in San Francisco on May 19, Prince won’t be doing any other shows because he intends to use the time studying the Bible. Prince said he’s prepared about 150 songs and will play a different selection at each show in London — including a version of the Beatles’ “The Long and Winding Road.” Prince also expects to do some unannounced gigs.