Pregnant British actress and singer Minnie Driver has declared she'll spend the summer "fat and happy".

The first time mother-to-be is months away from giving birth but told one US magazine she's already bracing herself for sleepless nights.

The 38-year-old has a busy couple of months coming up - she's releasing her album, Seastories in the UK and touring Europe, Hawaii and LA.

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Fat and happy: Minnie Driver, seen here at the premiere in Los Angeles at the premiere of her show The Riches' on the weekend, has declared that she intends to spend her summer getting 'fat and happy'

But after that, Driver says, she'll be getting in plenty of pre-baby rest and relaxation.

"I'm just going to have the summer to be fat and happy," she said.

"I'm going to be a very tired mother, I'm sure!" she said at a season premiere of US TV series The Riches, in Hollywood.

But she added: "No, I'm going to be happy. I'm going to be a happy mother."

The actress, wearing a black, body-hugging Calvin Klein dress and lavender cardigan, arrived alone at the premiere for her show The Riches' on the weekend, her first public event since announcing the pregnancy.

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She is still refusing to name the father but comments made on the red carpet by her co-star Eddie Izzard have continued to feed speculation about his identity.

Izzard said Minnie will make a great mother - but then seemed to suggest she could be doing it single-handedly.

"As long as there is one parent there that is giving love, then the kid is going to do great," Izzard said.

"I think she'll be a good mum because it needs love."

Driver announced her pregnancy last week on a US chat show and later joked about baby names with TV personality Ellen DeGeneres.

She revealed she's four months along and hopes it's a girl, but didn't name the father.

The screen beauty wore a figure-hugging Calvin Klein at last week's premiere and was later spotted sipping water at the afterparty.

Driver's fellow cast member Todd Stashwick added: "She's got a heart as big as the world. I think that could only [benefit] her children."