The couple tied the knot last summer.
Of course her little sister, Gracie, was also on hand to see Greta Gerwig's smash movie.
"It was pretty big," the singer admitted.
The Masked Singer host's boys turned two years old on Wednesday (June 14).
The singer also used her 2022 track "Birthday Girl" for the occasion.
The icon also received tributes from Jennifer Hudson and her record label Columbia Records.
"I told you yesterday that when I think about how much I love you, I want to sob and throw up," Eilish wrote of her mom.
A rollerskating party with McDonald's catering sounds about right.
The carnival-themed event also featured appearances from Jaden Smith and a parting gift: a "Bieber 29" hoodie.
The actress celebrated with a pic post from an ocean getaway.
