The 50-year-old actor is celebrating 10 years of wedded bliss with film producer Susan Downey, 41, and took to the photo-sharing site to express his joy.
Posting the sweet picture of them together, he wrote, "A perfect 10. Happy Anniversary, Mrs. Downey."
Robert and Susan met on the set of 2003 movie "Gothika" before getting engaged later that year.
The couple have two children Exton, three, and nine-month-old daughter Avri while Robert has a 21-year-old son, Indio, with his first wife Deborah Falconer.