Coming from a much publicized break-up is not always easy. This has been proven by 'Twilight' star Kristen Stewart who was recently photographed in a sour mood. The 24-year-old actress was clearly unhappy to be followed by paparazzi during her stay in Berlin, Germany for the shooting of her upcoming film, 'Sils Maria'.

According to Entertainment Wise, the brunette beauty flipped off the paparazzi to prove how annoyed she was.

This incident is not the first time Stewart exhibited rude behavior against photographers. She once yelled obscenities against them after being harassed: "You're a piece of s*** and you don't deserve to breathe the same air I do!"

Witnesses think that the 'Snow White and the Huntsman' star was probably asked questions about Robert Pattinson which then triggered Stewart's anger in Germany.

Despite reports of Stewart already sharing the same house with her co-star, she is rumored to still yearn for her former beau. "Kristen isn't happy that Rob has seemed to be so carefree filming his next movie and going out all of the time," says an insider.

Pattinson is currently filming a series of love scenes with Australian actress Mia Wasikowska for 'Map of the Stars', a satirical drama film to be released next year.

Earlier this year, the couple broke up after Stewart's affair with her then-married director, Rupert Sanders. Pattinson reportedly found it difficult to trust Stewart anymore that he opted to just end the four-year relationship.