Viva Las Vegas! If you're gonna be in Sin City this weekend, you should definitely make a cameo at Hotspot Tao in the Venetian. Hayden Christensen is having his 25th birthday bash there Friday night. Not a Hayden fan? Paris Hilton is also going to be in Sin City helping her zillionare boytoy Stavros celebrate his 21st birthday...don't forget to send us pictures if your there!