Heidi Montag is "excited" to start her own family.

Spencer Pratt and Heidi Montag

Spencer Pratt and Heidi Montag

The 'Hills' star congratulated her former co-stars Whitney Port and Lauren Conrad on the news they are both expecting children as she admitted it just hasn't been "the right timing" for her and her husband Spencer Pratt to have their own child.

Speaking in a video posted to the Faithwire YouTube channel, she said: "It seems like 2017 is the year to get pregnant. First and foremost, a huge congratulations to my two former co-stars Lauren Conrad and Whitney Port, who are both expecting.

"I have been planning for my own family and I am very excited for them, and it stirs up excitement with what's going to be coming up in my life hopefully soon too. And I think, on that note, it's important to not compare [your life] to other people's.

"Obviously I have been wanting children and I'm excited for it, but it hasn't been the right timing for me. So I think in life it's important for us to pray and prioritise God's timing in our lives and not compare [our life] to other people's. Because we're all different and we all have different things going on."

Meanwhile, the 30-year-old television personality previously expressed a desire to get pregnant in 2017 but admits she had to talk Spencer round first.

She said: "I am writing a coffee table wife type of book. It's more like a fun project, something I enjoy doing and then I'm getting ready to be a mom hopefully next year. So that is going to be my main priority and full-time job ...

"You know, I had to pray to get my husband to even ... agree to have a kid and so this whole journey over the last few years ... I have had to do.

"You know, it's not so easy, not everyone can just have kids whenever they want. There is a lot of hardship and prayers and certain things you have to put into that."