Julia Roberts is in awe of her kids growing older .

After celebrating her and husband Danny Moder ’s twins Hazel and Phinnaeus ’ 21st birthday, the My Best Friend’s Wedding star admitted it’s hard to believe how quickly time has flown by.

“It’s amazing, it’s astonishing,” she told Entertainment Tonight in a Dec. 1 interview alongside Luca Guadagnino . “Watching any child, but particularly your own children, grow up—Luca knows, he spends time with my kids—listening to their point of view of the world and things.”

Days earlier, the Oscar winner—who is also mom to son Henry , 18, with Danny— shared a sweet photo of her twins as babies on their big day, along with a heartfelt reflection on their growth.

“These game changers, life alterers, [heart] expanders once wer

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