SERENA Williams and fiancé Alexis Ohanian have announced that they’re expecting their first child together later this year.

The tennis legend shared the happy news on Snapchat, but what people are asking is who exactly is Ohanian, and how long have they been dating Williams? Here’s all you need to know…

Alexis Ohanian, 33, is a tech entrepreneur and best-selling author from the US.

He was born in Brooklyn, New York City, in 1983 to an Armenian-American father – whose family fled the genocide – and a German mother.

Alexis went to school in Ellicot City, Maryland, before graduating from the University of Virginia in 2005 with degrees in commerce and history.

It was this very year when Alexis did what he is most famous for – co-founding social news website Reddit.

Along with partner and fellow Virginia graduate Steve Huffman, the 6ft5 innovator set up the now-global name at the age of just 22.

The website went from strength to strength and was eventually snapped up by publishing giant Conde Nast – owners of Wired, GQ and Vogue magazines – the following year.

It was recently valued at £407million and is considered to be the seventh biggest site in the US.

Still a member of the site’s board of directors, Alexis was keen not to rest on his laurels.

He went on to launch social enterprise Breadpig in 2007 and helped set up travel search website Hipmunk in 2010, before co-founding the early stage venture capital firm Initialized Capital this year.

Alexis also wrote bestselling book Without Their Permission: How the 21st Century Will Be Made, Not Managed, which was published in 2013.

And he is a political activist – specifically in matters relating to the worldwide web.

He was dubbed “Mayor of the Internet” after his battles with US lawmakers over proposed bills aimed at cracking down on online copyright breaches.

Alexis and Serena got engaged in December last year. They had been dating – secretly – for 15 months after meeting in Rome.

The couple announced the news of their engagement on their social media accounts.

The lovers also posted a picture of them grinning from ear-to-ear and Serena showing off a spectacular rock in her diamond engagement ring.

In a poem posted on – where else? – Reddit, Serena wrote: “I came home / A little late / Someone had a bag packed for me.

“And a carriage awaited / Destination: Rome.

“To escort me to my very own “charming” / Back to where our stars first collided.

“And now it was full circle / At the same table we first met by chance.

“This time he made it not by chance / But by choice.

“Down on one knee / He said 4 words /And I said yes.”

And Alexis shared the happy news on his Facebook page writing: “She said yes”.

Alexis was also spotted cheering on his wife-to-be as she competed at the Australian Open.

The Reddit founder clapped and looked proud as punch as his wife-to-be won in straight sets to beat rival Belinda Bencic.

Serena went on to triumph in the final, dispatching her sister Venus to surpass Steffi Graf’s Grand Slam win tally and cement her status as the greatest of all time.

And she was around eight weeks pregnant at the time.

On April 20 Serena revealed she was 20 weeks pregnant with a Snapchat video showing off her baby bump.

The photo was quickly deleted but her representative later confirmed the pregnancy.

And US Open Tennis responded: “Serena Williams will have a new pride and joy to hug and call her own soon! Congratulations on the exciting baby announcement!”

She later shared a moving tribute to her unborn child on her Instagram page, saying how she “couldn’t wait to meet them”.

Serena, who has still been playing during her pregnancy, then gave a big clue that she will resume tennis once she’s had the child as she wrote: “I can’t wait for you to join the players box next year.”

It continued: “But most importantly, I am so happy to share being number one in the world with you… once again today.

“On @alexisohanian bday from the world’s oldest number one to the world’s youngest number one. Your Mommy.”

The tennis legend broke the internet when she revealed she was 22 weeks pregnant in mid-April.

This would make Serena around half-way through pregnancy, which usually lasts for around 40 weeks.

Another 20 weeks would make the baby due around the end of August or beginning of September, the latter of which is the month the star turns 36.

Although Serena previously said that the sex of the baby will be a “surprise”, it seems sister Venus may have outed the gender during an interview with Eurosport – where she referred to the tot as a “she”.