PIC: Beyonce finally reveals first pic of twins

The 35-year-old star - and now mom of three - shared the first official photo on her Instagram account. 

Confirming their names, she wrote:  'Sir Carter and Rumi 1 month today.' 

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Soon after the birth, the billionaire couple filed to US authorities to copyright "Rumi Carter" and "Sir Carter," ensuring no one profits from the names to sell anything from fragrances to music.

They are the younger siblings to five-year-old, Blue Ivy.