Molly Sims feels sick at the thought of her 40th birthday.

The model and actress - who has an 10-month-old baby boy called Brooks with her producer husband Scott Stuber - is set to celebrate the milestone on May 25 and despite being excited to host a big bash, she admits the idea makes her want to ''vomit''.

She told UsMagazine.com at Hudson Jeans Annual Benefit in Brentwood, Los Angeles on Thursday (25.04.13): ''I kind of want to vomit in my mouth, but yes, I am excited. We are counting it down, it's like 37 days. I want to vomit.''

To take the pressure off, Molly is thinking about having a joint birthday celebration with Brooks, as he will turn one on June 19.

She said: ''We might do a little joint birthday. Someone's turning one and someone's turning 40!''

But the blonde beauty is looking forward to celebrating her first Mother's Day on May 12 in America.

She said: ''I am so happy. It is the best Mother's Day. It's the best. I have my husband, I have my family, I have my child. I'm in such a good place and I never thought it would be this great.''

Molly also claims that she can't stop gushing about her little boy, who recently took his first step.

She said: ''It brings me so much joy. I have to say it's the most content I've ever been in my life.''