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He shared a photo of the publication and gushed over her work, writing in the caption: 'This is a MASTERPIECE, reads like a thriller. A must read.'
Daily Mail Australia has contacted Sam, his management and Laura for comment.
Private: They managed to keep their romance relatively private over the years, but appeared together in public at the 2018 Mid Winter Ball at Parliament House (pictured) and the 2019 AACTA Awards in Sydney
'A must read': Their split comes after the Kiwi actor praised Laura's Quarterly Essay called The High Road: What Australia can learn from New Zealand, in an Instagram post last month: He shared a photo of the publication, saying 'This is a MASTERPIECE, reads like a thriller'