Viva Films, Inc., and SM Development Corporation (SMDC) bring you this romantic-comedy movie entitled, Who's That Girl? starring Anne Curtis, Luis Manzano, John Lapus, and Eugene Domingo among others.

Who's That Girl? is a one-of-a-kind romantic-comedy movie about a girl who is an alleged mistress of a business tycoon, husband to Eugene Domingo's character, and father to Luis Manzano's character. Anne Curtis plays the role of Elizabeth Penrosa, a sexy lady, wallflower who's main goal in life is to get the attention of Johnny Eduque (Luis Manzano), the son of a business tycoon.

One day, when Elizabeth saw the name of Johnny in an obituary, she immediately went to the wake and mistakenly identified the departed person to be her Johnny, the man of her dreams. Not knowing who's wake it is, Elizabeth made a scene in the funeral and was instantly mistaken to be as the other woman of the departed business tycoon, father to Johnny Eduque. Without her knowledge, the departed was the senior John Eduque.

The Eduque Family cannot accept this newly-created fact (that the father has a mistress) which made the mother (Eugene Domingo) experience depression and nervous breakdown. This incident and scandal in the Eduque family made Johnny swore to get the identity of the girl who ruined his family's reputation and made her mother depress; and make her suffer. With the help of his assistant (John Lapus), Johnny finally finds out the identity of the girl and he is on with a plan that will make her pay for what she did to his family.