UNCASVILLE, Conn. - The Mohegan Sun casino officially threw open the doors of its glitzy $1 billion hotel expansion this weekend with a star-studded $2 million bash that was more fun than creaming the house with a royal flush. Ex-President Clinton wailed on the sax with the Blues Brothers, talk-show titan Rosie O'Donnell dueted with Cyndi Lauper and Cher was Living Proof that Vegas-style entertainment has a new home in New England. ``When you have Cher, Cyndi Lauper and Steven Tyler in the house, why would you even think of going to bed?'' ex-``Party of Five'' gal Jennifer Love Hewitt...