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Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Kate Middleton

Chris Jackson/Getty Images

Today is a very special day for Kate Middleton and Prince William!

No, their little one hasn't arrived yet, but the day does mark the royal couple's fourth wedding anniversary!

The expecting duchess was seen driving to Buckingham Palace earlier this morning, despite the fact that she's said to be several days past her due date with baby No. 2.

Middleton also popped by to visit Buckingham yesterday, with Prince George and his nanny in tow, for a quick daytime outing.

Despite being out and about, the U.K.'s Telegraph is reporting that the soon-to-be mother of two will likely be induced this week.

Fans from around the world have gathered outside of St. Mary's Lindo Wing, where Middleton is expected to arrive and give birth to the newest royal baby.

But will this be the last addition to the family? Well, not so, according to Middleton's uncle Gary Goldsmith.

"I don't think they'll stop at two," he revealed to Hello!. "So if it isn't a girl this time around, people shouldn't be too disappointed."

He continued, "I'm sure there'll be a girl in the mix at some point. As long as the baby is healthy, that is the important thing."

And if it just so happens that Middleton gives birth to a baby girl, her uncle already knows that she will be nothing short of gorgeous.

"Kate was a beautiful girl," Goldsmith shared. "If she were to have a girl, she'll be equally as beautiful."

Love all things Royals? Make sure to watch E!'s first-scripted series The Royals Sunday nights at 10 p.m. only on E!