Here Maria Menounos displays a nearly classic over-the-shoulder flirtatious look. She is looking over her raised right shoulder, with a modest social smile (Note she is not showing a true, felt smile - while this is ironic to some, a great social smile, which allows her eyes to be nicely open and on display, is a nonverbal which is more flirtatious in this setting). Maria's head is mildly down-turned and her wide, doe-eyed gaze is looking at her man of interest.
Although the beautiful Ms. Menounos does quite well on autopilot, this flirtatious look would be even more evocative if her head would have been more down-turned, giving the appearance of looking up more. Some additional body language cues - such as if Maria would have been biting her lower lip slightly or perhaps coyly licking her lip - would have every man in sight believing she was "the one".