The image has already racked up more than seven million likes, making it the most liked photo of all time on Instagram. The expectant mum wrote: "We would like to share our love and happiness. We have been blessed two times over. We are incredibly grateful that our family will be growing by two, and we thank you for your well wishes – The Carters."
Beyoncé and Jay Z, who married in 2008, are already the proud parents to five-year-old daughter Blue Ivy. The music power couple are set to become a family-of-five later this year and fans cannot be more excited!
In the meantime, check out our gallery of the cutest celebrity twins who are stealing the spotlight! From Sarah Jessica Parker's little girls to Mariah Carey's cheeky youngsters – and not forgetting Princess Charlene of Monaco's adorable royal babies – prepare for cuteness overload...
Mariah Carey and Nick Cannon
Mariah Carey knows a thing or two about raising twins. The pop powerhouse welcomed a son Moroccan and a daughter Monroe with her ex-husband Nick on the couple's third wedding anniversary in 2011. The fraternal twins were born in April, with Monroe weighing 5 lbs 3 oz, followed by Moroccan weighing 5 lbs 6 oz.
Following Beyoncé's viral announcement, Mariah congratulated her friends. "Congrats Bey and Jay!!! I'm so happy for you both. Having twins is the most incredible experience ever! Love, Mariah and the twins," she commented on Beyoncé's photo.
It was double baby joy for J Lo and Marc in February 2008 when they welcomed their twins, a little girl named Emme and a boy called Maximilian. Emme was first to arrive at 12.12am weighing 5 lbs 7 oz, while her brother arrived at 12.23am weighing 6 lbs.
The singer, who affectionately calls her twins her "coconuts", has spoken candidly about how life has changed since becoming a mother.
"The kids honestly just gave me a new direction," she told People. "They just made me realise what was real and what wasn't real. They just changed everything."
She added: "I started asking more questions of myself, of love, of what was right, of what was wrong, all because I wanted their life to be great too. And I knew for their life to be great my life had to be great, and I needed to fix some things, and that is where all the music came from."
Angelina Jolie and Brad Pitt
One of Hollywood's most famous mums, Angelina Jolie, delivered fraternal twins via caesarean section in July 2008 in Nice, France. Son Knox Leon arrived first at 6.27pm, followed by daughter Vivienne Marcheline, who arrived a minute later.
The twins were the fifth and sixth children for Angelina and her ex-husband Brad, who are also parents to Maddox, Zahara, Pax and Shiloh.
Sadly the couple announced their shock split in September 2016, saying that their children would remain their priority.
Zoe Saldana and Marco Perego
Zoe and Marco's two-year-old twins are just the cutest! But don't be deceived, the identical brothers can be quite the handful. Speaking to HELLO! Online, Zoe admitted that life with her kids was "fun" but "you get overwhelmed quite easily and really quickly".
The Avatar actress regularly shares snaps of her sons on Instagram, showing the pair getting up to all sorts of mischief. They've tried to break into Mum's handbag, and used each other as climbing frames.
Princess Mary of Denmark
Denmark rejoiced when their future king, Prince Frederik, and his wife Princess Mary welcomed not one, but two, royal babies in January 2011. Speaking to the press after the birth, Frederik joked that he would name his son Elvis, because he shared a birthday with the king of rock 'n roll.
The Danish royals settled on Prince Vincent and Princess Josephine and at seven weeks old, the little tots posed for their first official portraits.
The twins may only be six years old, but Vincent and Josephine are already used to a life in the spotlight. They have accompanied their parents, and their older siblings Prince Christian and Princess Isabella, on official engagements. Their first high-profile outing was their royal christening when Vincent and Josephine were just three months old.
Sarah Jessica Parker
Sarah Jessica's twin daughters were born via surrogate on 22 June 2009. The actress and her husband Matthew Broderick had been married for 12 years when they welcomed Maroin Loretta Elwell and Tabitha Hodge to their family. The proud parents also have a son, James Wilkie, who was six-years-old when his sisters arrived.
Sarah Jessica has previously said: "They're at an age – and have been for many years – where they really have their own identity. Sunday through Thursday, the rule is they can wear whatever they want. And if we go to the theatre or to the ballet, I get a say. But it's really among choices that they approve of."
Prince Albert and Princess Charlene of Monaco
Asked if she wanted children in 2013, two years after her wedding to Prince Albert, Princess Charlene said: "I think kids will come. I don't put any pressure on myself. If it happens, it happens."
In December 2014, the couple were doubly blessed when they welcomed twins, Prince Jacques and Princess Gabriella. Although Gabriella was born first, her brother Jacques is first-in-line to the throne due to Monaco's male-preference cognatic primogeniture.
The small principality of Monaco rejoiced when the royal babies were born. Well-wishers lined the streets to catch a glimpse of baby Jacques and baby Gabriella in May 2015 at their spectacular christening.
As they get bigger, the two-year-old twins are developing distinct personalities. Jacques is "a real boss" who takes after his father, Charlene revealed in an interview with Paris Match, while Gabriella has "a real princess attitude". "I can tell you that her favourite colour is pink and that 'no' is a word she doesn't like," said Charlene.
She added: "(My son) only needs a little sleep, and he's looking around all the time. He's very observant and has developed a real protective side, which he directs towards his sister Gabriella. They interact in their own little world. It's amazing to watch them."
Patrick and Jillian Dempsey
Their son Darby is passionate about football, while their other son Sullivan wants to follow in Dad's footsteps and become an actor. Patrick Dempsey was speaking about his beautiful family when he opened up about his twins, who turned ten earlier this month. The boys are Patrick and wife Jillian's youngest children.
The couple also have a 14-year-old daughter, Talula. "Talula loves cooking. She's incredibly creative," the former Grey's Anatomy star told People. He added of his children: "I'm constantly amazed by their insight and their observations. It's fascinating and fun to come up with answers to their questions. And the questions are getting harder!"
They are the proud parents to six-year-old twins Gideon and Harper and often share photos of their adorable kids on Instagram. David, who married his How I Met Your Mother co-star Neil in 2014, opened up about his brood to HELLO! magazine.
"They have great personalities," he said. "They're really great kids. We're really fortunate." As for whether they plan on adding to their family, the dad-of-two admitted, "No! We just got a puppy [Gidget]. That's enough. That's enough."
Julia Roberts and Danny Moder
In November 2004, Oscar-winning beauty Julia Roberts gave birth to twins, daughter Hazel and son Phinnaeus. Explaining their sweet monikers, the actress said: "Hazel is an old-fashioned name, and she's a strong, perfect Hazel.
"With Phinnaeus my husband wanted to name him Finn, which I liked, but it seemed like a nickname… So I said we had to have a proper name, and then we can call him Finn."
The couple went on to have another son, Henry Daniel, in June 2007.
Celine Dion and René Angélil
On 23 October 2010, Celine welcomed her twin sons, Eddy and Nelson, with her husband René. The little boys were born when Celine was 35 weeks pregnant and spent some time in a neonatal intensive unit before heading home with their proud parents.
Speaking exclusively to HELLO! magazine about her babies, who were conceived after six IVF tempts, Celine said they have made her life "extraordinary".
Sadly, René passed away in 2016. Celine has been staying strong for her youngest family members and during an interview with Today, she said: "They sense that mum is okay. They know what's going on. They know that dad is not coming back. My kids are fine, so I'm fine."
The Livin' la Vida Loca singer became a dad in August 2008, when his twin boys Matteo and Valentino were born by a surrogate mother. His children are his priority, his number one fans and, it appears, his fiercest critics.
"You don't know the level of criticism I get from my kids. They go, 'Dad, that movement I don't like. Dad, that song, you gotta change it,' and they bring good points," he said.
Ricky, who is engaged to his partner Jwan Yosef, added: "They're always with me and always travelling and on the road with me, but I always kept them backstage. Their perception of my job was to see me from the side singing, but they didn't know to what."