The 50-year-old music mogul wants to look his best when he ties the knot with make-up artist Mezhgan Hussainy, 36, and is embarking on an exercise and beauty regime in order to look "youthful" on his big day.
A source said: "Simon has booked in for the works. He`s getting everything done so he can do Mezhgan proud on the big day.
"He`s spending a fortune on Botox and fillers to try to keep a youthful look, and he`s going back to the dentist in LA to get costly teeth enhancements.
"The way Simon sees it is that if he`s gone through all these treatments in the past for a TV show, he can certainly do it for his wedding day.
"As the ceremony nears, he`ll have weekly microdermabrasion facials, which will give his skin a healthy glow. He`s been promised that it will knock at least five years off him.
"And he wants a body to match, so he`s hired one of the top personal fitness trainers in the UK and Los Angeles to help him tone up and work out."
Despite his plans, Mezghan is said to be trying to talk her fiancé out of his extreme make-over plans, but he is refusing to listen.
The source added to Britain`s Star magazine: "Mezhgan thinks Simon looks great the way he is and doesn`t want him wasting his time getting all the treatments - but there`s no talking to him.
"He keeps saying he`s dating a woman 14 years younger than him, so he needs to keep on his toes and look the part.
"So as soon as they finalise the date, Simon will begin his treatments and start working out."
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