Kate Middleton teases bareheaded Prince William with this cheeky nickname

Just because her husband will be the King of England someday doesn’t mean she can’t rib the royal.

Kate Middleton, 41, has some cheeky nicknames for Prince William, 41, according to one royal source, including one endearing moniker for his smooth head — “baldy.”

Tom Quinn, who is the author of the February 2023 book “Gilded Youth: An Intimate History of Growing Up in the Royal Family,” claimed that he was told by palace staff that the Prince and Princess have pet names for each other, just “like all couples,” according to The Mirror.

The author reported that Middleton calls William “babe,” but also has some sassy names for her husband, like “Big Willy” and “baldy.”

These comebacks were apparently concocted after the “nudge” that the late Queen Elizabeth II used to tell Middleton, which was that she “didn’t have a full-time career” before getting married to her husband.

Quinn claimed that Prince William also has some nicknames for Middleton, which include “Babykins” and “Duchess of Doolittle.”

The Post reached out to Kensington Palace for comment.

The royal couple first met when they were students at The University of St. Andrews in 2001, per Town & Country, but their relationship didn’t become public until 2004 when they were spotted by the press while on vacation together.

They broke up briefly in 2007, but quickly got back together that same year, and married in April 2011 at Westminster Abbey.

The couple have three children together — Prince George, 10, Princess Charlotte, 8, and Prince Louis, 5.

And, it looks like they’ve taken their love for fun nicknames and passed it on to some of their children over the years.

In May, just a few days after King Charles’ historic coronation ceremony, Middleton revealed the sweet name that she calls her youngest, Prince Louis.

While the royal family was visiting a Brownie troop in Slough, England, for an initiative called “The Big Help Out,” Middleton instructed her son to make a s’more.

“Pop that in the fire, Lou-Bug,” Middleton told Louis as they toasted marshmallows together at the event.

But Prince Louis isn’t the only royal child with a special name.

Charlotte is reportedly called “Lottie” by her mom, while George is known as “PG Tips,” according to Harper’s Bazaar.

The couple’s eldest, Prince George, recently celebrated his 10th birthday on July 22.