'Harder than it looks': Gwyneth Paltrow opens up about co-parenting with Chris Martin

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The former couple at the 3rd Annual Sean Penn & Friends HELP HAITI HOME Gala benefiting J/P HRO on Jan. 11, 2014. Photo: © Kevin Mazur/Getty Images for J/P Haitian Relief Organization

'Harder than it looks': Gwyneth Paltrow opens up about co-parenting with Chris Martin

The former couple at the 3rd Annual Sean Penn & Friends HELP HAITI HOME Gala benefiting J/P HRO on Jan. 11, 2014. Photo: © Kevin Mazur/Getty Images for J/P Haitian Relief Organization