The twin version of Leonardo Da Vinci's Mona Lisa goes on display in Paris' Louvre museum, along with the master's last painting "The Virgin and child with Saint Anne."

It's the copy of the world's most famous smile.

This replica of Leonardo Da Vinci's Mona Lisa temporarily joined her sister in the Louvre museum in Paris.

Although it's made by one of Da Vinci's assistants, the copy teaches a great deal about the original, according to the museum. – Video by Reuters