The 'Bleeding Love' singer - who was discovered by the music mogul and was signed to his SyCo/Sony label after winning 'The X Factor' in 2006 - has revealed there are no hard feelings between the pair after she brokered her new multi-year deal with Island Records behind his back.
She told The Mirror newspaper: ''I was offered another deal with Syco but I thought it was time to have a new team with fresh ideas.
''I have spoken to Simon. He is sad I didn't stay with Sony but he is happy for me and proud.
''He has been so supportive and he will continue to be supportive and I can always call him up for advice.''
She added: ''It is like leaving home almost. You have to be like, 'Later, mum and dad'. I am doing my own thing now. ''They have given me a great launch pad and I felt it was time for something different - a new phase. Now I'm able to spread my wings, fly and make something for myself.''
Although rumours emerged that Simon, 54, felt snubbed by the 29-year-old singer, he previously took to Twitter to congratulate her on her new contract and thanked her for for putting 'The X Factor' ''on the map''.
He wrote on the social networking site on earlier this month (03.06.14): ''Congratulations Leona. We had 7 great years together and now wish you all the best for the future. You put X Factor on the map. X (sic)''
He'll be performing a new residency at an intimate theatre.
Queens of the Stone Age front man Josh Homme has described their new music as ''an experience''.
Vicky Cornell explains that they're planning to pay tribute with a sculpture.
It's their first foray into television.
Luc Besson has loved the Valerian story for many, many years.