Interestingly enough, the "Hold Up" singer spent some quality time with the former President Bill Clinton backstage during the show.
Bey was spotted chatting it up with Mr. Clinton, who also spent some time with her rapper hubby, the founder of the festival.
According to Us Weekly, Beyonce spent the rest of the day sitting front row at some of the performances, like her pal Chris Martin's with Coldplay.
Chance the Rapper even sang a special rendition of "Happy Birthday" to Yonce, while she danced next to her man in the crowd.
But, the festival is the just one of the many activities Queen B has done for her birthday weekend.
Yesterday, her mom Tina Knowles posted a photo from her daughter's early celebration dinner on Instagram.
"A beautiful early celebration of my baby's 35 Th birthday given by one of the most amazing people ever in life," she wrote next to the festive photo.
Earlier over the weekend, Beyonce took her daughter Blue Ivy Carter to visit Camp David, Maryland. The duo hung out with FLOTUS Michelle Obama and her two girls, Sasha and Malia Obama in honor of her birthday.
And, on Friday, Sept. 2, she showed off a new puppy on Instagram in a set of photos with her baby girl, 4.
What a jam-packed birthday weekend it's been for Bey!