Arnold Schwarzenegger spends Christmas with Maria

Arnold Schwarzenegger and estranged wife Maria Shriver spent Christmas together for their children.

Arnold Schwarzenegger reunited with Maria Shriver for Christmas.

The 'Terminator' star and Maria separated after 25 years together in May but put on a united front over the festive period for their four children, Katherine, 22, Christina, 20, Patrick, 18 and Christopher, 14.

A source told People.com: "They had a really nice time over the holiday."

Arnold - who Maria filed for divorce from after it emerged he had fathered a child with a housekeeper - visited their former marital home in Brentwood, California, and they also attended basketball team Los Angeles Lakers' opening game of the season at the city's Staples Center.

Arnold and Maria have spent a number of occasions together since separating, including his 64th birthday just two months after they parted in May.

However, the situation has not been easy for Maria and she has previously admitted she was left "down and confused" about the breakdown of her marriage.

Speaking about a recent experience with a friend who has intellectual disabilities, she said: "When I was going through my own challenges this year; feeling down and confused, I got an email from him. He wrote me a note saying, 'You're my best friend Maria and you will never be left out.'

"When the world is so complicated, the simple gift of friendship is within all of our hands. Thank you to everyone who came up to me this weekend and wished me well."