Millie Bobby Brown couldn't have been happier for her older sister Paige in a sweet social media post shared in celebration of her intimate wedding day .

The 21-year-old took to Instagram on Thursday to share insight into Paige's special day as she tied the knot with her fiancé, Sam.

Wedding bells

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"Big sis said 'I do'," Millie captioned the post, which began with a gorgeous black-and-white photo of Paige and Sam dancing down the aisle.

The next snap saw the Stranger Things star positively glowing as she entered the wedding ceremony, wearing a strapless blue bridesmaid gown with a thigh split and a draped scarf made of the same fabric.

To learn more about Millie's own wedding to Jake Bongiovi, watch below... WATCH: The making of Millie Bobby Brown and J

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