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It first appears in "7 Continents for 7 Koopas". Having ordered each of his kids to take over one of the Real World's seven continents, Bowser orders Kootie Pie Koopa to wreck havoc in Europe. Kootie Pie complies by heading to the Louvre, where she transforms all of the artwork into portraits of herself. Those that are shown are:
Later on, Mario comes by to steal Kootie Pie's magic wand, and uses it to restore all of the original artwork. He also creates a wave of water from the Birth of Kootie, which washes Kootie Pie out of the Louvre.
The Louvre also briefly appears in the episode "Super Koopa". Bowser invites his kids to run amok in Paris, so Hip and Hop travel to the Louvre, where they employ Paragoombas to remove many of the original paintings. Hop is seen putting up some of his own so-called "masterpieces", while Hip is seen vandalizing the Mona Lisa.
Although Hip and Hop eventually leave the Louvre, it is never shown as to how the original artwork is restored to the museum.