The 35-year-old singer told Jonathan Ross he's blissfully happy with his half-American, half-Turkish girlfriend Ayda Field, and the pair could be ready to start a family in the next few years.
"She's really broody, and I'm getting there," said Robbie, in scenes to be shown on Friday Night With Jonathan Ross, this week on BBC One.
He added: "I thought I was going to be a bachelor, then I was introduced to Ayda and things just changed. She's a wonderful person and I'm in love."
Robbie also showed off his Take That tattoo as he revealed he's working with his former bandmates again.
When asked if he would be performing and recording with his former group, he replied: "We've got together, done bits and bobs. I can't say much, but yes, I hope so."
The singer also addressed concerns over his wide-eyed appearance on X Factor, when he performed his new single Bodies.
"The doors got stuck, I thought what are the words... I get incredibly nervous... it wasn't drugs or drink, just deer in the headlights."
I've always been very nervous... You don’t know what's going on in my head. It's traumatic, really scary."