Elizabeth Hurley (left) and Shane Warne are engaged.

Shane Warne has blasted his ex-wife for slamming Elizabeth Hurley.

 Simone Callahan is unhappy that Shane's fiancee is called "M2" or "mummy two" by their kids Brooke, 14, Jackson, 13, and Summer, nine, but Shane says her complaints in a magazine interview were "out of order" and he would have no problem with his kids having a nickname for her boyfriend Toby Roberts.

 Speaking on Australian TV show 'Eddie McGuire Tonight', he said: "It was out of order to say it was disrespectful for the children to call Elizabeth M2.

 "If Simone and Toby get married and (the children) want to call him T-Man or T2, go for it."

 And the Australian cricket legend is adamant it is time for Simone to "let it go".

 He added: "Don't come out and do paid interviews - and do 14 or 15 of them - and keep saying it's disrespectful and having a go. Just move on with your own life. Just accept it and say look how good the kids are."

 Shane insists he is happier than he has ever been and a big part of that is because his fiancee - who has a 12-year-old son, Damian, from a previous romance - gets on so well with his kids.

 He explained: "Imagine if the kids go, 'Dad, what are you doing with this girl? We don't like her at all. She's horrible. She treats us badly and we can't wait for her not to be there.' That would be an absolute horror.

 "So I'm very, very lucky that Elizabeth is so good with the children. The way she is with the children, she's fantastic.

 "She takes an interest with them. She takes them to school, helps with the homework, does all those things, and she has fun with them.

 "I've been the happiest I've ever been in my life right now. My kids are happy, my family's happy.

 "For the first time in my life, I'm really, really happy.

 "I'm fitter than I've ever been. I'm healthier than I've ever been. My children are really, really happy. I'm happy. Everything's going pretty well. Life's great." - Bang Showbiz