United Kingdom, May 11 -- Ryan Reynolds paid a heartfelt tribute to Blake Lively on Mother's Day (10.05.26).

The 49-year-old actor - who has James, 11, Inez, nine, Betty, six, and Olin, three, with Blake - took to social media on Sunday to heap praise on Blake, describing the former Gossip Girl star as "fearless" and the "absolute love of [his] life".

Alongside photos of them together, Ryan - who has been married to Blake since 2012 - wrote on Instagram: "I appreciate this mother beyond measure. She is kind. She is fearless. She's the absolute love of my life and to our four little kids, she's the life of their love."

Ryan made the social media post shortly after Blake and Justin Baldoni, her It Ends With Us co-star and director, reach...