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

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.