<p>CHELSEA Clinton and Ian Klaus spent Valentine's weekend in Montreal keeping each other warm in the deluxe Hotel Gault. After checking in last Friday, they weren't seen emerging until Saturday night, when they braved the icy wind and made it to Buona Notte, where Chelsea sipped a Champagne cocktail and ordered seared halibut. "They wanted a romantic table. They were completely humble, obviously in love, and so incredibly polite," said a restaurant source. When asked how she knew about their restaurant, Chelsea replied: "A friend of my father's told me." Hmmmm. Maybe that was Bill's blonde friend from Canada, Belinda Stronach.</p>