Sexes of ​Beyoncé and Jay Z's twins​ reportedly revealed

Beyoncé's twins have arrived and Blue Ivy now has a younger brother and sister​, according to multiple reports.

Details have been kept under wraps o​n the twins​'​ arrival, which reportedly happened in a Los Angeles hospital on Monday​,​ June 12. However, according to TMZ, a "minor issue" has kept the Bey babies in for a longer-than-expected stay.

WATCH: Beyonce Reportedly Gives Birth to Twins!

Meanwhile, Mathew Knowles, seemingly scooped his own daughter with the birth confirmation in a Twitter post on Sunday, writing: "They're here! #beyonce #twins #jayz #happybirthday."

Beyoncé and Jay Z memorably announced her pregnancy in an instantly iconic photoshoot in February, which went on to be the most liked post on Instagram.

NEWS: Tina Knowles Dances the Night Away Amid Speculation That Daughter Beyonce Has Given Birth to Twins

ET has reached out to reps for Beyoncé and Jay Z for comment.

Track Beyoncé's pregnancy below: