Want to look like a starlet? Just combine good genes with Seven jeans. At about $150 a pair, the butt-flattering pants are popular with everyone from Reese Witherspoon to Brandy, who's nine months pregnant. "Seven has just the right amount of stretch to fit all shapes," says a rep at L.A.'s Fred Segal. "That's the genius of it." After two years of being sold only at high-end retailers like Fred Segal and Curve in Beverly Hills, Seven jeans have finally hit upscale chains, including Neiman Marcus and Nordstrom. But the brand isn't looking to dress just anyone. "You won't be seeing 'Ann' in Ohio with them on," says a rep. "Most people don't even know they exist." Well, until now.