Burke: 'X Factor' stint was 'nerve-wracking'

Alexandra Burke admits her 'X Factor' judging stint was the "most stressful time ever".

The 'Bad Boys' hitmaker - who won the ITV1 show in 2008 and then returned to stand in for Kelly Rowland when she was struck down with a throat infection two weeks ago - explained while it was an honour to impart her wisdom on to the current hopefuls, she found the experience "nerve-wracking".