On December 17, 2021, Hereditary Grand Duke Guillaume and Hereditary Grand Duchess Stephanie of Luxembourg attended the award ceremony of the 3rd edition of the Biennale "De Mains De Maitres", held at the Arbed building (19 Liberte) in Luxembourg. The 3rd "De Mains De Maîtres" Biennale ended with the traditional presentation of the Leir Foundation Jury Prize and the RTL Audience Prize.