Minnie Driver has confirmed she is pregnant and feeling sick "morning, noon and night".

The British actress - who was spotted outside a Los Angeles baby clinic last month - revealed she is expecting her first child when chat show host Jay Leno quipped she had made too many trips to the buffet.

Minnie, who appeared on the 'The Tonight Show with Jay Leno' on, joked: "Are you calling me fat? You've noticed my tummy, haven't you?"

Jay then asked: "Are you pregnant?"

To which Minnie replied: "Yes, I am. I love being pregnant more than anything else, but I am sick."

"I don't know why they call it morning sickness. I am sick morning, noon and night, but it's a fair trade-off."

Minnie, 38, revealed her nausea has become such a problem she has to carry a box with her to be sick in wherever she goes.

She joked: "You spend so much time in your car in Los Angeles, I had to get a travel puke receptacle. I was in traffic the other day and I knew I was going to throw up, and I was like, 'Oh Lord,' but I knew I had my handy Tupperware vomit receptacle."

The 'Good Will Hunting' star - who previously dated Matt Damon and was engaged to Josh Brolin - refused to reveal who the father was, simply saying: "I'm the public person and he can stay private."

Minnie has also been romantically linked to John Cusack and was rumored to be engaged to magician Criss Angel.