It looks like Kristen Stewart might be a little bit miffed that she was caught snogging the face off her Twilight co-star and obvious boyfriend, Robert Pattinson over the weekend.

Why you ask? Well, KStew flipped the waiting paparazzi the bird as she got into a car after arriving at LAX airport from Montreal this morning.

Both Rob and Kristen climbed into the waiting car after making their way through the airport, but the paparazzi presence seemed to tick the actress off and she couldn't play nice anymore!

Are you glad that Robsten are out in the open now? Tell us on Twitter @areyouentwise

Kristen's not always grumpy...