Today host Tom Steinfort, 42, announces wife Claudia Jukic is pregnant with their third child: 'I'm doing my bit!'

New Today show co-host Tom Steinfort revealed on Monday that he and his wife Claudia Jukic are expecting their third child.

The presenter, 42, shared the exciting news during an on-air segment about Australia's declining birth rate, joking he was doing his 'bit' to contribute.

'I'm doing my bit around here! I'm excited to share that my beautiful wife Claudia is expecting,' Tom began.

'We are having baby number three! Our two little gorgeous girls are going to have a little brother or sister, so let's see!'

Tom and his wife are already proud parents to young daughters Lotte and Frederikke. 

He added that he and his wife had asked not to be told the sex of their unborn child, keeping it a surprise. 

'It's been a bit of a bumpy start. Claudia has been handling it really well,' Tom said. 

Tom and his Croatian wife married in her home country in August 2019. 

The happy announcement comes amid renewed attention on Tom and his new Today co-host Sylvia Jeffreys, whose professional partnership comes with a surprising history.

The pair were once romantically involved more than a decade ago, long before they became two of Nine's most familiar faces, according to The Daily Telegraph.

Now, after years of separate careers, marriages and family lives, the former flames will reunite on the Today couch five mornings a week. 

The revelation comes after Nine officially confirmed Sylvia and Tom as the program's new permanent hosting team last week, following a major shake-up at the network's breakfast operation. 

The pair's appointment follows the decision not to renew Sarah Abo's Today contract during her maternity leave.

Abo, who filmed her final show just weeks before giving birth to her first child in July, was expected to return to the program in several months. 

She had been expected to return alongside a new co-host after Karl Stefanovic departed in June. 

She was instead told by Nine executives that her contract would not be renewed after she rejected alternative roles, including that of a newsreader.

Sylvia and Tom's appointment has attracted plenty of attention, but the pair have considerably more history between them than their years working together at Nine.

Versions of how long they dated have varied, with some suggesting they were together for around eight months.

However, a source close to the former couple said their relationship was considerably shorter, lasting closer to a couple of months. 

But the romance is now firmly in the past, with both journalists having gone on to marry and start families of their own.

Sylvia is married to fellow journalist Peter Stefanovic, with the couple also expecting their third child together.