SAPPHIC SISTERS

ANOTHER day, another celebrity coming out of the closet. This time it's "Terminator 3" hottie Kristanna Loken. When The Advocate came to interview Loken at her L.A. home, she let them know she was romantically involved with her "Bloodrayne" co-star, Michelle Rodriguez - who has never made a secret of her bisexuality. When the magazine asked her point-blank about Rodriguez, Loken giggled, "There is the $64,000 question. Um, I don't even know how to answer that . . . Just don't look upstairs, OK?"