To play lingerie-loving Gabrielle Solis on Desperate Housewives, Eva Longoria relies on "my good genes and the magic of television." Among her genetic blessings: a fast metabolism. Says costar Christine Estabrook, "Eva is the only (Housewife) I ever see eat." And turning 30 in March hasn't slowed her down. Longoria celebrated her milestone birthday in Cabo San Lucas, Mexico, where she wore a teeny bikini and, she says, "had lots of margaritas."