Sam Worthington's model partner Lara Bingle has finally confirmed the couple married in secret last year (14) while she was pregnant with their first child.

The Australian stars have been dating since 2013, and they were rumoured to have tied the knot prior to welcoming a son, Rocket Zot, in March (15).

They kept quiet about the gossip, but Lara has now revealed they wed in an intimate ceremony in Melbourne, Australia over the holidays in December, 2014 when she was six months pregnant.

"Sam and I, we got married nearly a year ago, last December... the 28th... It was very intimate, we just popped into Melbourne where Sam's family is from," she tells Australian radio's Kyle and Jackie O Show.

"There was just our families, less than 10 people... We wrote the whole celebration, we wrote all our vows... (It was) in a house we rented... I was six months pregnant... So it was super chilled, I cooked afternoon lunch!"

Lara goes on to reveal she struggled to find a wedding dress due to her blossoming baby bump: "Just before the wedding I was in London... Finding a dress when you are six months pregnant (is hard) I ended up finding a white Louis Vuitton dress."

She also opened up about motherhood and confirmed the couple is planning to have more children.

"Yeah definitely... The more the merrier... Sooner rather than later... Maybe like four (kids)," she adds. "Rocket was born in Los Angeles, and we live between the New York and L.A. But being home in Sydney now is nice. It's nice to be home everyday, and be with my mum.

"Rocket has the most amazing grandmothers - Sam's mum and my mum have been awesome... You don't get much freedom (as a mother)... I can't just go out, especially when he is feeding... (Motherhood is) the best thing in the world (but it is) very hard."