Perhaps it's the thought of her ex-boyfriend Robert Pattinson moving on without her or perhaps she simply got out of bed on the wrong side.
But something seemed to be bothering Kristen Stewart as she arrived for a flight at LAX on Monday.
The Twilight actress failed to raise a smile as she jetted out of LAX looking casual in white T-shirt, leather jacket and jeans.
The 23 year-old teamed her with a baseball cap with '' written across it over her long, hair.
Hiding her eyes with dark sunglasses, she carried a large over one shoulder and her passport and ticket as she walked through the international terminal.
She appeared to be travelling with a blonde female friend who carried a guitar.