Nico Tortorella ''can't wait'' to start having children.

The 29-year-old actor has admitted he's slightly envious of his 'Younger' co-star Hilary Duff now that she's expecting a baby with her boyfriend Matthew Koma because him and his wife Bethany Meyers are desperate to start a family together.

Speaking to 'Entertainment Tonight', he said: ''It's what we all are looking for in one way or another, and she's got it. She's preggers. I love pregnancy so much. I have the fever so hard right now... I can't wait to start having kids. I'm so excited.''

Hilary announced she was expecting her second child - a baby girl - last week but Nico has admitted he's known about her pregnancy for a few months now.

He explained: ''I've known for a long time. It's been really hard for me to keep it a secret. I've known for a few months.''

The 30-year-old actress also has six-year-old son Luca with her ex-husband MIKE COMRIE so Nico knows that she'll be a great mother to her baby daughter.

He said: ''She is such an incredible mom and I got to spend some time with Luca on set this year and he's just such an incredible kid. She's been talking about having another baby for years and I'm so excited that she gets to have one.''

But the cast and crew of her show 'Younger' did have to work hard to hide her bump while they were shooting the fifth season of the programme - and they did a good job as the series' creator Darren Star didn't know ''until after they wrapped.''

Nico explained: ''I think he was the last one to find out of all of us. [But] timing-wise, it's perfect. She's going to have the baby [and] we don't start shooting until next year.''