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Olivia Newton-John’s Daughter Chloe Lattanzi is All Grown-Up — Plus Other Celebrity Children Then and Now!

Olivia Newton-John, 66, and her daughter, Chloe Lattanzi, 29, stepped out at an event in Las Vegas on Saturday, Aug. 8 — and boy is the songstress' little lady all grown up!

Click through the gallery below to see Ava Phillipe, Harper Beckham and more of Hollywood's most famous kids then and now.