Beyonce shared the first photo of twins Rumi and Sir CarterBeyoncé congratulated her firend Serena Williams on the birth of her baby girl [Beyonce/Instagram]

The singer has led the celebrity congratulatory messages after posting a sweet Instagram picture dedicated to Serena.

Serena gave birth to her a baby girl on Friday 1 September with her fiancé Reddit founder Alexis Ohanian.

Beyoncé shared a stunning snap of Serena Williams cradling her baby bump and wrote: “Congratulations Serena!”.

Blue Ivy Carter’s mother welcomed twins with her husband Jay-Z just months ago, too.

A post shared by Beyoncé (@beyonce) on Sep 1, 2017 at 1:24pm PDT

Serena Williams updated fans on her pregnancySerena welcomed her first child on Friday 1 September [Serena Williams/Instagram]

Serena’s exciting news was announced by Us Weekly, who said she gave birth on Friday September 1 at a hospital in Florida. 

Venus William’s sister recently admitted that becoming a mother would not slow down her ambition, and she was already planning her return to the tennis court.

“I am looking forward to becoming a mother and coming back to the courts already,” she said The Telegraph.

“I’m always thinking about what’s next: the next victory, the next trophy.”

Serena Williams and Alexis OhanianThis is the her first child with her fiancé Alexis Ohanian on the red carpet [Wenn]
Pregnant Serena Williams showing off her blossoming baby bumpThe tennis star gave birth in Florida [Serena Williams/Instagram]

The 35 year old also kept incredibly active during her pregnancy, saying how important exercise was to her.

“I intend to keep exercising for as long as possible while pregnant,” she previously said. 

“I want to baby to be healthy and for that you need a healthy life. Also, when I come back to tennis it’ll be better if I’ve kept as fit as possible all the way through the pregnancy rather than having to lose a lot of weight afterwards in order to get fit again. 

“Eating healthily is a must, but being healthy is a lifestyle.”