'Ashamed' Kristen Stewart pulls out of premiere of her film

Kristen Stewart has reportedly cancelled her appearance at London premiere of her film On The Road because she is too embarrassed to appear in public in the wake of her cheating scandal.

The 22-year-old actress was originally planning to walk the red carpet for the adaptation of Jack Kerouac's classic novel on August 16 with co-star Tom Sturridge, a close friend of Robert Pattinson.

But a source told website RadarOnline that she has had second thoughts.

"Kristen won't be doing the red carpet for On The Road — she's too ashamed to show her face in public right now,” the source said.

"After everything that has been said, and in light of the revelations that she cheated on Robert with director Rupert Sanders, she's running scared at the moment.

"There's also the dilemma of standing next to her co-star in the movie, Tom Sturridge.

"He's very close to Rob and Kristen thinks it would be awkward for her to promote the movie on the red carpet alongside him.

"Kristen is very proud of her work for On The Road, she grew up reading Kerouac novels and this is a production she always wanted to star in."

They added: "If she appears at the London premiere, it will detract people from the movie itself and Kristen doesn't want that at all.

"She wants her performance and this film to be recognised for what it is — a great adaptation of a classic book,” the source added.