Pregnant Nicole Kidman takes her baby bump out for a spin

It was a case of another day, another work out for expectant mother Nicole Kidman, who appears more determined than ever to keep in shape.

The actress, who is five-months pregnant, was spotted leaving Revolution Fitness in Los Angeles over the weekend with her budding bump on show.

She arrived wearing her standard fitness outfit - black leggings, zip-up jacket and white t-shirt - and worked up a sweat with a spinning class at the centre on Sunday.

Taking pregnancy in her stride: Nicole Kidman leaving Revolution Fitness in Los Angeles over the weekend

Baby on board: Nicole's budding bump was on display during the outing

Inside, she was accompanied by her personal trainer and kept motivated by a soundtrack that included songs by Mary J. Blige, Bon Jovi, Culture Club and even a number by husband Keith Urban, a fellow gym-goer told People magazine.

Keeping herself in good health is clearly a priority for Nicole - her spokesperson was recently forced to deny reports she was drinking white wine at the Academy Awards late last month.

Spinning around: Nicole took a cycle class at the centre under the watch of her personal trainer

New York Post columnist Cindy Adams said Nicole was "boozing backstage" during the ceremony.

But Nicole's spokesperson Catherine Olim said: "Nicole Kidman most certainly did NOT drink white wine or any other alcoholic beverage backstage.

“She had water and lemon zinger tea. That's it."

It will be the 40-year-old's first biological child. She has two adopted children from her former marriage to Tom Cruise - Isabella, 15, and Connor, 12.