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A twin is one of two offspring produced in the same pregnancy. Twins can either be identical (in scientific usage, "monozygotic"), meaning that they develop from one zygote that splits and forms two embryos, or fraternal ("dizygotic") because they develop from two separate eggs that are fertilized by two separate sperm. In contrast, a fetus which develops alone in the womb is called a singleton, and the general term for one offspring of a multiple birth is multiple...

A self-portrait is a representation of an artist, drawn, painted, photographed, or sculpted by the artist. Although self-portraits have been made by artists since the earliest times, it is not until the Early Renaissance in the mid 15th century that artists can be frequently identified depicting themselves as either the main subject, or as important characters in their work...

A movie star (also known as a film star and cinema star) is a celebrity who is well-known, or famous, for his or her starring, or leading, roles in motion pictures. The term may also apply to an actor or actress who is recognized as a marketable commodity and whose name is used to promote a movie in trailers and posters. The most widely known, prominent or successful actors are sometimes called “superstars” by writers and journalists...