Did Nat King Cole and Rosemary Clooney sing Mona Lisa as a duet?

No, Nat King Cole and Rosemary Clooney did not sing "Mona Lisa" as a duet. The song "Mona Lisa" was recorded by Nat King Cole as a solo artist and released in 1950. Rosemary Clooney did not record a duet version of the song with Cole.