Jay Z and Beyonce. Picture: AP

Cape Town - US singer Beyonce has released the first official picture of her and Jay Z's twins in an Instagram post.

The 'Formation' singer and her 47-year-old husband welcomed their twins into the world last month, but have remained tight-lipped about the arrival.

Beyonce's Instagram post on Friday confirmed the names of the twins - Sir Carter and Rumi -  and gave fans a much-anticipated peak.