And of course the lady of the hour did not disappoint with her style choice. Beyoncé dazzled in a multi-coloured sequin jumpsuit, featuring just one pant leg.
And even though it's common knowledge that Beyoncé has some serious dance moving, her and Jay Z on the dance floor is still the highlight of the night.
Here are some of the other BeyDay highlights from her star-studded guests, which included Destiny's Child bandmates Kelly Rowland and Michelle Williams, sister Solange and her husband Alan Ferguson, Chance the Rapper, Usher, Serena Williams, Diddy, and Alicia Keys and Swizz Beatz, and of course, Blue Ivy.
Blue Ivy taking a lick of her mum's birthday cake during her speech. (Note: Beyoncé's outfit change):
Beyonce and Chance posing for the camera:
Alicia Keys rocking the 70s fringe with husband Swizz Beats:
Blue Ivy wishing her mum a happy birthday, in what is the cutest birthday wish ever:
Michelle Williams and her stylist Diandre Tristan as Sonny and Cher:
Beyonce in a pair of seriously sparkly hot shorts:
Beyoncé and Blue on the dance floor:
Best party of the year, right?