lady gaga, ciara, 50 cents, adam lambert, akon, rihanna, young jeezy, pete wentz, and executives from major records labels came out to support the vevo.com launch party. What is vevo.com? A new YouTube-powered Web site dedicated to music videos. It’ll include content from some of the world’s largest record labels, including EMI, Universal and Sony Music. Oh, and did we mention that it will boast Last.fm integration?