Natalie Maines, the lead vocalist for the Dixie Chicks, got her money's worth out of the crystal-covered vintage wedding gown she wore for her June nuptials to actor Adrian Pasdar, putting it on again for the thirty-fourth annual Country Music Association Awards in Nashville, Tennessee.  The singer, 26, who recently announced that she is two months' pregnant, had plenty of opportunities to show off the dress, as she and her bandmates, Martie Seidel and Emily Robison, took the stage five times--picking up four awards and performing their single "Sin Wagon" against a backdrop of raging flames.  "I guess the sophomore jinx didn't happen to us," said fiddler Seidel of the group's multi-platinum second album, Fly.  Shania Twain, 1999's Entertainer of the Year, presented the Chicks with the same top honor this year (they also won for Best Album, Best Video and Best Vocal Group).  Faith Hill and her husband, Tim McGraw, were also big winners, becoming the first married couple to be named Best Female Vocalist and Best Male Vocalist in the same year.  Accepting her award, Hill wanted to share the love.  "I feel so alone," she said, standing onstage without McGraw.  "I don't know who to hug.  Can I hug somebody?"