20. In the Good Old Summertime (1949)
Liza Minnelli’s first screen appearance was in this musical remake of The Shop Around the Corner, a vanishingly brief cameo as a three-year-old toddler. It’s full of poignant family significance and also uneasily prophetic, given that the adult Minnelli was all too often booked for nothing more than a celeb walk-on. The doe-eyed moppet appears in the film’s closing shot between Van Johnson and her real-life mother, Judy Garland; the pair, after their comedy-of-errors romance, are now assumed to be radiantly married parents. Little Liza is in an adorable white outfit: a mini-me getup matching her mother.