The 38-year-old actress - who has daughter Apple, seven, and son, Moses, five, with husband Chris Martin - appears for just 15 minutes at the start of new disaster movie Contagion, and said that she has made a conscious decision to back away from the larger parts.
'I have little kids, and I'm a full-time mum,' she told the Huffington Post while promoting her film at the Venice Film Festival, 'I really only do small parts.'
She stars alongside Kate Winslet, Matt Damon, and Jude Law in the Steven Soderbergh thriller.