Possible Clues:

• Louvre painting
• She has a memorable smile
• 16th-century work also known as "La Gioconda"
• Her image was stolen in 1911 and recovered in 1913
• Nat King Cole song about Da Vinci painting?
• One indulging in beef, reportedly, and lamb initially is a picture
• Work parodied by Duchamp
• Unusual Somalian portrait
• Painting partly shown on the original cover of "The Da Vinci Code"
• No salami butcher is an old painting