In an Instagram post on Monday, the 52-year-old actor wrote a sweet message to Meadow Walker on her birthday. The newly minted 21-year-old is the daughter of Paul Walker, Vin's Fast and Furious co-star who died in a car accident in 2013. "Happy Birthday Meadow! Meadow sending me love on this day," Vin wrote. RELATED CONTENT: EXCLUSIVE: Vin Diesel on Losing Paul Walker: 'The Last 3 Years Have Been Some of the Hardest' Embed Code RestartPaul Walker's Daughter Meadow Pays Tribute to Her Father on His BirthdayPaul Walker and Vin Diesel's Daughters Embrace In Sweet Photo TogetherPaul Walker's Daughter Meadow Posts Rare Tribute to Her Late Father: 'Thinking of You'