su cumpleaños
1. (his, her, or its anniversary; third person singular) 
Carlos pasará su cumpleaños en París.Carlos will be in Paris on his birthday.
Acuérdate de que mañana es su cumpleaños.Don't forget that her birthday is tomorrow.
Hoy hace un año que compramos nuestro perro, así que celebramos su cumpleaños.Today is one year since we bought our dog, so we're celebrating its birthday.
2. (formal) (your anniversary; second person singular) 
¿Cuándo es su cumpleaños? - El 15 de enero.When is your birthday? - On January 15th.
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