The Country Strong star, who has daughter Apple, six, and son Moses, four, with the Coldplay frontman, admitted that their seven-year marriage has had its “ups and downs”.
She told Good Housekeeping magazine: 'Marriage is hard. Chris and I have had our ups and downs, big time.
'Marriage is way more complicated than just who gets to control the remote. But, hopefully, we keep heading in the same direction and getting through the obstacles.'
She added that they are both fiercely protective of their private life and often avoid the paparazzi by not going out together.
She said: 'If I'm looking grumpy in public or if Chris and I leave a restaurant separately, it's only because we don't want to encourage photographers.”