Kristen Stewart has made a public apology to Robert Pattinson for cheating on him.

The 22-year-old beauty was photographed in a passionate clinch with her married Snow White And The Huntsman director Rupert Sanders, despite her relationship with Twilight Saga co-star Robert and she has released a statement admitting her guilt.

"I'm deeply sorry for the hurt and embarrassment I've caused to those close to me and everyone this has affected. This momentary indiscretion has jeopardized the most important thing in my life, the person I love and respect the most, Rob. I love him, I love him, I'm so sorry."

Sources close to the actress insist she wasn't having an affair with Rupert and it was a fleeting mistake. Kristen and Robert, 26, have been dating since meeting on the set of Twilight four years ago, in which they play vampire Edward Cullen and his love interest Bella Swan.