The Got Talent judge was determined to get her co-star in the traditional Scottish attire, even arranging a bet with More Talent host Stephen Mulhern that she could get the show's boss to flash his legs in the tartan outfit.
[Amanda Holden, Stephen Mulhern and Alesha Dixon - BGT Glasgow auditions]
Amanda Holden tweeted about her unusual fashion plans for Cowell yesterday morning:
In Glasgow for #BGT can't wait to see what today brings! Hoping Simon does wear his kilt! Think He had it steamed this morning!— OfficialAmandaHolden (@Amanda_Holden) January 28, 2013
Mulhern made a bet with Holden that Cowell wouldn't come in a kilt, vowing to strip off in the street if the reality TV mogul took up the challenge.
A concerned Mulhern tweeted: "If what I have just heard from Amanda Holden is true I will run around Glasgow naked. Nobody wants to see that!"
Holden cheekily replied: "I do!
"Simon Cowell darling. If you do decide on the kilt today Stephen Mulhern will run naked thru the streets of Glasgow!! Please!"
[Simon Cowell arrives at the Glasgow auditions - without a kilt]
Mulhern was saved the embarrassment of a nude run as Cowell didn't bow to pressure from Holden and arrived at the Glasgow auditions in his usual jeans.
Simon Cowell stuck in the same jeans - Photo gallery: