In the photo, the 35-year-old superstar singer and actress posed in her undies while cuddling the twins near her chest.
During her pregnancy, the performer showed off her maternity style with mini photo shoots on the social media platform. Especially if you claim to know incredibly valuable information such as the names of the most publicly anticipated twins of 2017.
"Sir Carter and Rumi 1 month today", shared Queen Bey.
Her father Mathew Knowles had tweeted on 18 June, saying: "They're here!" and "Happy birthday to the twins" - but the timing of Beyonce's post suggest they were actually born on 14 June. The rumour that the twins were called "Sir" and "Rumi" (which began when the Carters applied for a trademark on the names) appears to be true, according to Bey's Instagram announce above.
Looking stunning in a floral outfit, Beyonce has managed to keep images of her children from leaking online or elsewhere.
Fans had already speculated that this was when the star went into labour, as she was seen leaving her mansion and security at her local hospital was apparently stepped up.
In the new video, he recalls begging Beyonce not to leave him. Several weeks later the names "Rumi Carter" and "Sir Carter" were registered as trademarks with USA authorities.
Jay-Z and wife Beyoncé have been transparent about the challenges they've encountered in their union in their award-winning albums and songs. This rumor has yet to be verified, however.
Jimmy Kimmel recently responded to the alleged titles on his talk show, and did a man-on-the-street segment where he tricked people into believing the power couple named their twins some ridiculous names.