Showing appreciation of your spouse

Showing appreciation of your spouse in front of people in a way thats appropriate is sunnah

Amr ibn al-As: “The Prophet deputed me to read the Army of Dhat-as-Salasil. I came to him and said, "Who is the most beloved person to you?" He said, " 'Aisha." I asked, "Among the men?" He said, "Her father." I said, "Who then?" He said, "Then 'Umar bin Al-Khattab." He then named other men” (Bukhari)