The Girls Aloud star was believed to have cut ties with the music mogul after he took her to America from the UK show, but axed her during the early audition stages.
While she refuses to open up about how the news was delivered, she confirms she is now back on speaking terms with Simon - who desperately wanted to have a fling with her, according to his unauthorised biography.
Cheryl said: ''I have spoken to him many times since. If you're asking if there were interesting conversations ... absolutely.''
The 28-year-old 'Call My Name' hitmaker fought the pull of twitter before finally giving in last July, and admits she has since become something of an addict.
She said: ''I resisted twitter for so long, it was The Enemy for so long. But I love it now. I don't know what I was doing without it.''
Asked about any abuse she suffers on the social networking site, she told BBC Radio 1 DJ Chris Moyles: ''I find that the haters on there are quite hilarious. Just have a nice time and follow nice people!''