Kate Middleton and Meghan Markle
Meghan Markle and Kate Middleton have a good relationship. Pictured: Princess Beatrice, Princess Eugenie, Princess Anne, Prince Andrew, Duke of York, Prince William, Middleton, Markle and Prince Harry attend Christmas Day Church service at Church of St Mary Magdalene on Dec. 25, 2017 in King's Lynn, England. Getty Images/Chris Jackson

Kate Middleton and Meghan Markle's relationship is good.

According to Hello!, in less than six months, the Duchess of Cambridge and the "Suits" actress will be officially sisters-in-law. The publication noted that Middleton and Markle were "firm friends." In fact, Prince William's wife was "longing" to meet Prince Harry's fiancée.

In November, when Prince Harry and Markle appeared together in their joint TV interview following their engagement announcement, the royal prince described how it was seeing Markle without telling anybody. Then he shared that his brother and sister-in-law wanted to meet the actress and Middleton was "wonderful," Markle interjected.

The possibility of Middleton and Markle forming a great sister bond is likely as both share a number of sensibilities. In addition, the two women are "overwhelmingly down to earth."

After Prince Harry and the "Horrible Bosses" actress announced their engagement, Middleton was asked for her thoughts about it. "William and I are absolutely thrilled," Middleton said. "It's such exciting news. It's a really happy time for any couple and we wish them all the best and hope they enjoy this happy moment."

On Monday, Markle joined the royals for their morning walk and Christmas service. It was the first time Prince Harry, Markle, Prince William and Middleton have been photographed together. The two royal couples were all smiles as they walked side by side.

Earlier, there were rumors that Markle and Middleton are feuding. In fact, the Duchess of Cambridge allegedly stopped the "Suits" star from sending presents to Queen Elizabeth II. However, a source denied those reports saying that the beef between Middleton and Markle are "completely made-up" and "nonsense."

According to reports, Middleton will be helping Markle prepare for the royal life that waits for her. When the royal mom joined the British family in 2011, Sophie, Countess of Wessex, assisted her. This time, Middleton will be doing the same favor to Prince Harry's fiancée. The Duchess of Cambridge is expected to be the "Suits" actress' mentor and confidante.

Although Middleton and Markle have a good relationship, it is unlikely for the former to be the latter's matron of honor. "She [Middleton] is the future queen consort when William becomes king after his father, and would unlikely be an attending person to another royal bride," Marlene Koenig, a royal expert, said.