Molly Sims has found her third pregnancy "really, really stressful".

She said: "Being 43 ... we wanted to tell everyone, but we were super nervous about, you know, the testing ... so it's just been really, really stressful, but everything so far is on track."

But the 'Fired Up!' star has been experiencing "crazy" morning sickness and constantly feels nauseous, even though she is now in her second trimester, a period where the symptoms typically start to ease.

She said in a video on her website: "I've been crazy sick.

"I wake up in the morning, I feel like I wanna vomit. I have lunch and wanna vomit, and wanna vomit at dinner ... and then when I go to bed, I still want to vomit.

"I have vomited at grocery stores, I have vomited in my house, I have gagged on my toothpaste."

But Molly has been able to indulge her cravings, tucking into a hot chocolate "every single night".

She said: "With Brooks, I literally ate, like, seven apples a day. With Scarlett, I ate, like, seven oranges a day. And with this one ... it's crazy, but it's chocolate.

"My girlfriends last night were here visiting me, and they were like, 'Are you drinking hot chocolate?' Oh, I was -- with the little mini marshmallows that are really not good for you. I have one every single night."

And Molly is finding it much more difficult with two young children at home, especially as her hormones have made her unpredictable.

She said: "It's much more tiring. I don't get anything done.

"I think I'm much more hormonal. I'm like the crazy bitch sometimes -- I'll be really nice one time, and really crazy the next.

"My husband loves me right now. He really loves me."