Serena Williams has some great wedding day advice for her friend Meghan Markle

With the wedding of the year looming closer and closer with each passing day, Meghan Markle and husband-to-be Prince Harry must be getting some serious excitement jitters right now - and they aren't the only ones! All around the country, people are preparing themselves for the big event. Grandmas across the nation are baking cakes, little boys and girls are looking forward to dressing as princes and princesses, and families planning on street parties are praying that the day doesn't get spoiled by the Great British weather.

But nobody could be more enthused about the wedding than those who are actually going to be there. And that includes one of Markle's best pals, Serena Williams.

The two became friends around three years ago, at which time Markle tweeted a snap of them hugging at the US Open.

"[Williams] quickly became a confidante I would text when I was traveling, the friend I would rally around for her tennis matches, and the down to earth chick I was able to grab lunch with just a couple weeks ago in Toronto," Meghan later wrote on her blog.

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However, the former Suits star did not attend William's wedding to the Reddit co-founder Alexis Ohanian last year. Despite this, the pair have remained close friends and there have been rumors floating around that the tennis star will be in attendance at the upcoming Royal do.

Before she could talk about whether or not she'd be heading to Windsor for the big day, though, the tennis star was asked whether she had any advice for Markle in an interview with Good Morning America.

Without missing a beat, Williams was straight in there with a hot wedding tip.

"I just think it's so important to enjoy the moment, you know," she said, before hastily adding: "eat cake! I didn't get to eat mine at the wedding - we were just having so much fun."

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But not all of Williams' pearls of wisdom were cake-based (although, let's be real, the cake is the most important bit of the day). "I think if I could give her any advice it would just be to enjoy the preparation and enjoy the planning," she said, "because it goes so fast."

Despite her good advice and close friendship to the actress, however, there's a chance that Williams might not make the wedding, as she apparently has a tennis tournament going on at the same time.

In fact, when asked whether she would be attending the big do, Williams said, "I don’t know, I think it's during one of the tournaments, I'll see if I can make it."

But - who knows - perhaps she just said that to throw the interviewer off the scent. After all, it'd have to take something pretty special to make someone miss out on their friend's wedding, especially when it's a royal one.

So far, very few guests have been confirmed, and we're not even 100 percent sure that the new baby Louis will be coming along for the celebrations. Thankfully, we've only got a few weeks to go now - and we can't wait to see who's there on the big day!