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Simon Cowell will turn 50-years-old on Wednesday and threw himself a $1.6 million birthday bash on Saturday night. The site of the London affair was at Wrotham Park in a specially erected and elegantly appointed mega tent. Invitations for the black tie event went out to a select group of Cowell’s 40 closest friends and colleagues.

Guests included Simon’s mother Julie Cowell, Randy Jackson, Ryan Seacrest, ex-girlfriend Terri Seymour, Sir Phillip Green, Jamie Hince, Kate Moss, Sir Elton John, Naomi Campbell and funny men James Corden and David Walliams.

Also on hand were Piers Morgan, Nicky Byrne of Westlife, Holly Willoughby and her husband Dan Baldwin, Jackie St. Clair, Gordon Ramsay, Declan Donnelly, Georgie Thompson, Katie Price, Sharon and Ozzie Osbourne, Leona Lewis, Dannii Monogue, Louie Walsh, Amanda Holden, Kelly Brook and Alexandra Burke.

Our photo gallery below also captured guests Cheryl Cole, Myleene Klass, Baron Sugar of Clapton, Michael Winner, Alex Reid, Amanda Holden, Max Clifford and Claudia Winkleman.

View the entire gallery below – click to expand thumbnails.

Photos: WENN