The world champion hurdler announced her engagement to IT consultant Rajiv Chaudhri on Facebook over the Easter long weekend.

Chaudhri is a board member of the Western Sydney Academy of Sport. They met a few months ago, shortly after she gave birth to her third child - her second by sperm donor - Jemima.

"It's been an incredible whirl wind the last few months with the birth of my daughter Jemima and now meeting my soul mate," she said.

"I apologise to those who haven't met him yet or who I haven't had the chance to sing his praises too [sic]. Last night on his birthday, whilst we were out with both our families, he proposed. I am the luckiest lady alive. Our beautiful families will combine."

The 34-year-old was previously married to British athlete Chris Rawlinson. The couple married the week after Pittman competed in the 2006 Commonwealth Games.

Proceedings for their first divorce commenced in April 2009. After it was finalised in 2010 they reunited, re-married and relocated to Britain until splitting again in April 2011. Pittman then returned home to Australia with the couple's son, Cornelius, 9.

After struggling with infertility, the athlete became a mother for a second time via IVF and a sperm donor and gave birth to Emily, almost 2.

Last year she said used the same donor to conceive Jemima.

"Motherhood is my new Olympics," she told Woman's Day.

Pittman made history in 2014 when she became the first Australian woman to compete in both the summer and winter Olympic Games, the latter in the two-person bobsleigh event.

She is now studying medicine but admits moving away from professional sport has taken a toll because that "elusive gold medal never happened."

"I think part of my lack of retirement issues … was trying to prove to other people that I am actually a good athlete; that I am actually worth who I am," she told SBS's Insight last week.

"[It] took a long time, probably getting into the medical school, before I realised that actually I'm okay just as I am."

"I think that is one of the biggest challenges we have as retiring athletes: being able to accept, for us, what is mediocre."