Beyoncé Went To Same Baby Doctor As The Kardashians

RUMI & SIR CARTER BIRTH CERTIFICATES REVEAL KARDASHIANS' BABY DOC DID THE DEED

Now we know ... Rumi Carter is the big sister and Sir is the little bother -- their birth certificates reveal when and how they came into the world.

doctors for Beyonce and Jay-Z's twins, and it nails down their delivery date and time -- June 13 at 5:13 AM. Rumi came out first, and Sir followed shortly thereafter.

What's really interesting is the doctor who pulled off the delivery -- none other than Dr. Paul Crane. The same guy who delivered Kim and Kourtney Kardashian's 5 kids ... and Rob and Blac Chyna's little girl, Dream.

That guy's catcher's mitt is well-worn!