Comedian Dave Chappelle was spotted chillin at the launch party for Prince’s “21 Nights” in New York Friday night. ”21 Nights” is the coffee table book of photos from where Prince did 21 concerts in 21 nights. The tour was completed back in September and the book has now been released. (CLICK HERE if you missed the sneak peek of the photos.) The New York launch party was blessed by a performance by the elusive purple mister himself and party-goers included Chapelle, as well as Howard Stearn (with his new wife), Tom Green, Spike & Tonya Lee and Dennis Rodman (with his bag of onesies…).