London, July 23 - 'American Idol' judge Simon Cowell will be confronted by 17 of his ex-girlfriends at a special bash organised ahead of his birthday.

Cowell will be turning 50 in October, but the bash is being organised this weekend. Hosted by his ex and close pal, model Jackie St Claire, the star has been told to 'expect the unexpected' at the white-themed party in West London, reports mirror.co.uk.

Some of the guests include Terri Seymour, singer Dannii Minogue and Cheryl Cole. 'American Idol' judges Paula Abdul and Randy Jackson will also be there.

'For most men this would be an utter nightmare, but luckily Simon has the gift of the gab. If anyone can pull it off, he can. And, if truth be told, he's actually on exceptionally good terms with nearly all of them so there shouldn't be any waterworks or embarrassing tantrums -- either from the girls, or Simon,' said a source.