Merry Christmas!
:) Feliz Navidad, Joyeux Noël, as well!
Sra
let's still add:
Buon Natale, Mele Kalikimaka, Frohe Weihnachten, Radosnych Swiat Bozego Narodzenia and Kala Christooyenna (sorry, I don't have the Polish accents or Greek letters on my computer)