Jessica Simpson's pregnancy is making her "cry at the drop of a hat".

The 31-year-old star - who is expecting her first child with fiance Eric Johnson - admitted her emotions are more heightened than usual, and she cried "big crocodile tears" when she felt her baby move for the first time the other day.

She said: "That's the one thing about pregnancy - I'll cry at the drop of a hat. Even a great souffle would make me cry.

"I felt the baby move the other day for the first time and I had big crocodile tears. It was the coolest thing ever. It did a flip or something. I was like, 'There it went. It's there. It's really there'."

Jessica explained she has also been craving comfort foods throughout her pregnancy.

Speaking in an interview on 'The Rachael Ray Show', she added: "This week it's peanut butter and jelly sandwiches, toasted. And then, I'll put some salt on my hand like I'm taking a tequila shot and then take a bite of the sandwich."

Meanwhile, Jessica's three-year-old nephew Bronx - the son of her younger sister Ashlee and Pete Wentz - is convinced she is carrying a baby girl.

She said: "He rubs my belly. He has guesses. He said he wants it to be a girl. He thinks it's going to be a girl."