Beyoncé Wishes Her Twins Rumi and Sir a Happy 4th Birthday - Yahoo Entertainment

2," Beyoncé wrote on her website, wishing her twins Rumi and Sir a happy 4th birthday.

The 28-time Grammy Award winner, 39, wished twins Rumi and Sir Carter a happy 4th birthday Sunday on her website.

"Happy birthday Rumi & Sir.".

She and husband JAY-Z, 51, who also share daughter Blue Ivy, 9, welcomed daughter Rumi and son Sir on June 13, 2017.

RELATED: Beyoncé Shares Mother-Daughter Selfie with Blue Ivy Plus Rare Photos of Twins.

I know my daughter is watching," Beyoncé said in her speech