The duo's new biography Sweet Revenge: The Intimate Life of Simon Cowell claims the 40-year-old singer had a steamy affair with her X-Factor co-star earlier this year.
But in a new interview with UK Glamour magazine, Dannii revealed she be won't curling up with the book and a hot cup of cocoa any time soon.
The recently single star (she split from model Kris Smith in April) told the mag, "I havent' read the book but I've been told about the excerpts that relate to me and the speculation of my private life.
"From what's been reported, they [Tom and Simon] put hundreds of hours into making this book, and Tom is a respected journalist.
"They looked very pleased with it all at their launch. I'm sure it makes for a great read and I wish them the best."
Not that we're expecting rumours of her fling with Simon to disappear.
Dannii recently turned down the reality TV king's invitation to appear on the next season of The X-Factor, leading to speculation there's a wee bit of tension between the two.
But she told the mag her decision was purely about business.
"I was offered the chance to return, but I decided it wasn't the right thing for me, as yet again it didn't fit the commitments I'd already made to Australia's Got Talent.
"I am fiercly passionate about every show I commit to. I had four incredible years on The X-Factor, but the show has moved on, and so have I."
Moved on and returned to Oz — we're not complaining!
Simon isn't the only bachelor Dannii's been rumoured to have hooked-up with this year. Earlier this week her rep denied reports she "snogged" Aussie hearthrob Johnny Ruffo at the recent Australia's Got Talent wrap party.