Nousatsu Junkie

Naka is an aspiring young model with a problem: her face tenses up into a terrifying spectacle whenever she gets nervous on photo shoots! Naka's rival is Umi, the hottest model at their agency. But Naka soon discovers Umi's secret--and hilarity ensues behind the cameras!

(Source: Tokyopop)

Note: Includes two extra chapters.