The 38-year-old actress, who is married to and has two children with Coldplay front-man Chris Martin, said that despite their combined fame, she would never want to share their intimate details with the public.
She told CNN, 'When I see high-profile relationships now, I think, 'Oh my God', even though I'm technically in one.
'But we sort of don't do anything public, we try to keep it [as] behind the scenes as possible. Because it just generates more interest... it just undermines the quality of your life.
'It's just unnecessary to be a public couple, and to have your couple-dom, or whatever, be its own entity. It doesn't make sense to have that in the public world,' she said.