SHE’S PERFECT! How do they pick people...

SHE’S PERFECT! How do they pick people for those national TV commercials? Sometimes right out of the swimming pool blue. Someone saw Mary Hamilton of Irvine at a swim meet, thought that she would be perfect for a new Yoplait yogurt campaign, and called the head of her swim club, the Irvine Novas. Hamilton, 37, a computer specialist and mother of three, says they told her later they were sold on the combination of her beautiful butterfly stroke and her femininity. . . . The ad, which started this week, will run a year and pay her up to $30,000 in residuals.