Miss Mills has vowed to return to the catwalk and resume her career as a model when her marriage ends, even though her settlement will be enough to ensure she never has to work again.
She worked as a catalogue model before losing her leg when hit by a police motorcyclist 13 years ago.
She has since reinvented herself as an animal rights activist and political campaigner. Miss Mills has now signed up to the little-known model agency Zone.
Yesterday, it was reported she has instructed her agent she wants to return to the catwalk later this summer.
Her actions have been described by some as further evidence she is a self promoter, who grew upset at living in Sir Paul's shadow.
As their marriage collapsed after four years, some of her friends hoped she might adopt a lower profile.
The latest development may reinforce Sir Paul's conviction that he made the right decision in seeking a divorce.
He was understood to have become increasingly fed up with his wife's determination to pursue a high-profile lifestyle despite his desire for a private, domestic existence at his Sussex estate.
The couple, who have a daughter Beatrice, two, announced their separation this month after it emerged they were living in separate houses 50 miles apart.
In a statement, they blamed the media, saying they found it 'increasingly difficult' to maintain a normal relationship in the public eye.
Despite speculation that Miss Mills could get up to £200million of Sir Paul's fortune, recent reports suggest her settlement is likely to be closer to £25million.
