Cheryl Cole is now Lady Cheryl, after Simon Cowell apparently bought her a title for her 30th birthday.
The X Factor boss splashed out on a piece of land in the Scottish Highlands that give the owner a title, The Sun reported.
Simon, 53, took to Twitter to deny he had snubbed an invitation to the party.
He wrote: "I didn't snub Cheryl's party. I just couldn't go because of my filming dates. We are close friends again and I adore her."
The pair fell out after he sacked her from The X Factor USA in 2011, but have since patched up their friendship.