Singer Kelly Clarkson has vowed never to appear on the big-screen again - because her last foray into acting was "horrible."

The Since U Been Gone hit-maker starred in comedy musical From Justin to Kelly in 2003, as part of her deal for winning the first series of reality TV show American Idol. The film was a box office flop, widely panned by critics - and Clarkson insists she will never be tempted to make the transition from musician to film star again.

She tells Attitude magazine, "Oh it was a movie I had to do, and it was so horrible. Whoever won (American Idol) had to do it....

Kelly Clarkson was "forced" into starring in the flop movie From Justin to Kelly: With Love when she signed her first record contract after winning American Idol. The Miss Independant singer, 23, and American Idol runner-up Justin Guarini, co-starred in the film musical, which entered the US box office charts at a lowly number 11 in 2003.

Three years on, Clarkson is still embarrassed with the movie. She says, "Two words: Contractually obligated. I knew when I read the script it was going to be real, real bad, but when I won, I signed that piece of paper, and I could not get out of it.
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