Isla Fisher was mistaken for her husband's daughter at a party.
The 35-year-old actress - who has a three-year-old daughter Olive and another girl, aged around eight months, with spouse Sacha Baron Cohen - was amazed to be refused alcohol and taken to a special room at the first showbiz event she attended with the 39-year-old British funnyman, who she has been in a relationship with since 2002.
She said: "My first Hollywood party was awesome. It was for the director Sofia Coppola and was just walk-to-wall with shiny, fabulous people.
"I came to the front door with Sacha, and the hostess goes, 'Sacha, you go through to this room and you come with me.'
"And she grabs my hand and takes me to this room filled with 12 year olds - not even 15 year olds! - and goes, 'Sit here. Would you like a drink?' So I go, 'Can I have a glass of wine?' and she goes, 'No, you cannot.' She thought I was Sacha's daughter, basically."
The 'Rango' star also admitted she doesn't usually enjoy celebrity parties because they are so tame.
She told Elle magazine: "Most people don't know that Hollywood parties end at 10pm. I'd rather see a movie."