'ABBA' legends to appear as guest judges on Cowell's 'X Factor'

'ABBA' legends Benny Andersson and Bjorn Ulvaeus have reportedly agreed to appear on music mogul Simon Cowell's UK talent show 'The X Factor' as guest judges.

An insider has claimed that the 'American Idol' judge has invited both Swedish songwriters to appear on the show towards the end of the series next month.

"This is a major coup for us. To get the guys who wrote ABBA's hits to be involved in our show is just amazing," Contactmusic quoted the source as telling the Daily Star.