Lily Aldridge is pregnant.

The 32-year-old model - who already has a six-year-old daughter Dixie with her Kings of Leon husband Caleb Followill - shared the happy news in an Instagram post in which she showed off her tiny bump in a bikini and captioned it: ''SURPRISE.''

The Victoria's Secret beauty previously revealed she has a special ''bond'' with her fellow models Behati Prinsloo and Candice Swanepoel, because they all had children around the same time.

She said: ''We [Aldridge, Behati Prinsloo and Candice Swanepoel] all had kids at the same time and we have this bond - it's a really nice community of model moms. I am so proud to be a mom, it's the greatest achievement in my life without a doubt.''

Lily also said being a parent has made her worry less about her figure and thinks people should be less judgemental.

She added: ''It's been a while now since I had that moment of having to get back in shape [after giving birth], but there should be no judgement, everybody's journey is different. Of course, as I get older my body is changing, I'm a woman, but I love it. I love working out and I love being healthy but I don't judge myself so much; I don't care if I have a six-pack any more.

''I am inspired by all these amazing women who have fuller bodies and don't care about cellulite. I have cellulite, too, and I have stretch marks. When I was younger I would be like, 'Oh, my abs need to be firmer'; now I look back and I'm like, 'You were crazy! Your abs were gorgeous!'''

However, Lily has admitted she suffers from mom guilt but knows it is important to have her career too.

She said: ''You know, I wish I could just be there every second of the day. But then I'm also so proud that I'm a working mom. One day I think she's going to be really proud.

''Obviously family is my number one priority, always. And I am so lucky to work with incredible clients that I get to bring my daughter with me on trips and she gets to be a part of this magical journey with me. But it's all balance and all of us are still trying to figure it all out as moms or businesswomen - all those things. Just try to be the best you can be.''