Jessica Simpson has revealed that pregnancy has done wonders for her sex life.

The 31-year-old Fashion Star mentor, who is just weeks away from giving birth, boasted during an interview on Ryan Seacrest's radio show that she was having the best sex of her life.

She said of her love-making with fiancé Eric Johnson, 32: "I am definitely feeling intimate. I'm kind of unstoppable right now.

"The Big O is, like, the biggest O ever."

She said her soon-to-be husband and former NFL pro Johnson was "always ready' to feed her sexual appetite.

Simpson was in the news again recently for posing nude on the cover of Elle magazine: "They didn't even ask me to do that, It was my idea," she said. "It just seemed a natural thing for me to do.

"I'm 170lb and I wanted to pose nude. It's funny to be at your heaviest and feel the most confident. I just take such pride in being a mum. I love my body more than ever now."