"I know he's watching down on you and proud of you like my brother and I. Ka mau te wehi, me to mahi ako I te Reo Māori. Ka nui te aroha kia koe mama!"
Fans shared Weepu's joy, one commenting: "This is so awesome! Makes my heart full for you seeing this buddy."
The 71-test All Black retired from all forms of rugby in October last year.
After a career which saw him wear the number nine jersey for the Hurricanes, Blues and All Blacks, as well as several overseas sides, Weepu spent what would be his final season playing for Wairarapa Bush in the Heartland Championship.
Weepu made his provincial debut in 2003 for Wellington, playing with the Lions until 2011 when he switched to Auckland from 2012 to 2014.