The mother-of-two also explained how she and the Avatar star settled on the names of their children, Racer and Rocket Zot, reports News Corp.
“I don’t know, I just love Racer, I just thought it was a really cool name and Sam liked it too,” she said.
“There was loads of names. I loved the name Jet but I couldn’t really have a Rocket and a Jet.
“We didn’t know it was going to be a boy. Well the first time we didn’t (find out) and the second time... there’s not many surprises so I thought let’s just keep it a secret.”
She added: “They’re both happy and healthy babies — they’re really good boys.”
Racer is now six-months-old, while Rocket Zot was born in March, 2015.
Since touching down in Sydney on Thursday, the model’s busy schedule has included a visit to the factory where her bronzing and tanning line The Base is produced.
Worthington shared a snap on Instagram showing her testing products and swapping high fashion for a high-vis vest and hairnet.
This article originally appeared in marie claire Australia.