Kristen Stewart met Rupert Sanders on the set of Snow White And The Huntsman

Kristen Stewart's parents understand why boyfriend Robert Pattinson is more than a bit miffed with their daughter after she admitted cheating on him last week.

John and Jules Stewart are believed to have been supporting the actress at their home in Woodland Hills, California since the news broke - but they know Kristen has made a mistake.

'They feel Kristen has really embarrassed herself and don't blame Rob for not calling her back,' a source tells the Daily Mirror.

'This is not the Kristen they know.'

Robert, 26, hasn't been seen in public since Kristen confessed to her fling with married director Rupert Sanders but has vowed to hit the red carpet to promote his new movie Cosmopolis in the US.

Security staff are reported to have been told that Kristen, 22, is not welcome at the movie's New York premiere on 13 August.

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Anna Duff