21st Birthday Party design. We love this guest book motif, which also has to do with birthdays, celebrations, parties and 21. A fun gift for friends or family. 21 Es Ist Mein Geburtstag. Funny: the cool sayings motif is related to 21st birthday and humour! It also affects sayings. Fun 21 It's My Birthday design. Lightweight, Classic fit, Double-needle sleeve and bottom hem