In English, a quinceañera is often called a “sweet fifteen.”
The phrase is a direct description of the birthday being celebrated and parallels “sweet sixteen,” the better-known English-language birthday expression. “Sweet fifteen” is especially common when explaining the tradition to people unfamiliar with the Spanish term.
The expression does not replace quinceañera in every community. Many families use fiesta de quince años, quince, or quinceañera in both Spanish and English conversations. The chosen wording often reflects family history, region, and the language used at the event.
A sweet fifteen should not be confused with a standard birthday party merely because both mark an age. A formal quinceañera may include a ceremony, an organized court, symbolic gifts, choreographed dances, and a reception, although none of those elements is universal.