Meghan Markle will reportedly be among the guests at Serena Williams' wedding later today (16.11.17).

Meghan Markle

Meghan Markle

The Grand Slam-winning tennis star is poised to tie the knot with Alexis Ohanian, who is the co-founder and executive chairman of Reddit, in an intimate ceremony at New Orleans' Contemporary Arts Center.

The high-profile couple have made a conscious effort to keep details of their wedding day under wraps, with guests being warned against posting images on social media.

In fact, the attendees - who are also expected to include the likes of Ciara, Kelly Rowland and Eva Longoria - have not even been told the wedding location, according to the New York Post newspaper.

But Meghan, who is Prince Harry's girlfriend, is expected to be present at the nuptials, having developed a close friendship with Serena over the years.

Meanwhile, a source recently claimed that Meghan and Harry - who have been dating since mid-2016 - are already "as good as engaged".

The flame-haired royal is reportedly waiting until the right moment to make a formal announcement of the couple's plan to marry each other.

An insider recently explained: "While Meghan may not be wearing a ring or a formal engagement announced, it's fair to say they're as good as engaged now.

"They've spoken about their marriage plans openly with each other, and friends and family around them are pretty much thinking about wedding attire already!"

Prior to that, body language expert Dr. Lillian Glass claimed Harry is more "relaxed" with Meghan than he was with his previous girlfriends.

She said: "First of all, we've never seen Harry this relaxed with anybody. That's number one. Every girl he's been with, there's kind of been a distancing, an uptightness about him, a real formality. But with Meghan you really see there's a connection."