Beyoncé is one of the world's most famous singers but to her the most important thing in her life is family.MORE: Beyoncé's fans in disbelief over star's rare appearance with her childrenAnd on Saturday, the Lemonade hitmaker marked her husband Jay-Z's 52nd birthday with her children, Blue Ivy, Rumi and Sir.The family are notoriously private when it comes to their personal life but no doubt made sure the rapper had a day to remember.VIDEO: Beyoncé's daughters Blue Ivy and Rumi steal the show during rare appearanceJay will have also been celebrated by Beyoncé's Destiny's Child family, with the star recently being praised by Kelly Rowland – who refers to him as "big bro".MORE: Beyoncé sings with Kelly Rowland's son during Destiny's Child.
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