PDO
---
$slug = 'aaralyn-barra';
$STH = $DBH->prepare( 'SELECT * from modelos LEFT JOIN modelos_bio ON modelos.id = \'modelos_bio.modelid\' WHERE modelos.slug = :slug;' );
$STH->bindParam( ':slug', $slug, PDO::PARAM_STR, 50 );
$STH->execute();

mysql query from command line using
SELECT * from modelos LEFT JOIN modelos_bio ON modelos.id = modelos_bio.modelid WHERE modelos.slug = 'veronica';