January 5, 2016 11:38 AM EST

Bradley Cooper turns 41 Tuesday, but his favorite birthday memory is from when he turned 8.

The actor shared his memorable birthday story with The Scene, explaining that McDonald’s birthdays were “a big thing” when he was growing up. “We would get Egg McMuffins…I loved the little trays with the party….every kid would have little party boxes that you would eat all your stuff in.” Guess we know how he gained those 40 pounds for American Sniper.

Happy birthday, Bradley Cooper, this Big Mac’s for you.

[H/T Mashable]

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