Shane Warne's ex-wife Simone Callahan is set to explode about her new relationship; just few days after the cricketer got engaged to his lady love Elizabeth Hurley.

Callahan and her new partner of nine months Toby Roberts have signed a deal with a magazine to tell all about their relationship, the Daily Telegraph reported.

The spin king declared his love for Hurley by popping the question with a mighty sapphire-and-diamond ring last week in St Andrews, where he was taking part in the Alfred Dunhill Links golf tournament.

But now his ex-wife to tell all about being bowled over by handsome sales executive Roberts.

The pair maintained a dignified silence all last week before quietly spoken Roberts told Confidential they were relaxed about the news and fuss surrounding it.