It has been incessantly reported that Kate Middleton has been meddling in her brother-in-law's personal life. Reports claim that the Duchess of Cambridge is urging Prince Harry to ditch his "untrustworthy" ex-girlfriend, Cressida Bonas over her fears that her half-sister is Prince William's first choice in marriage, Isabella Calthorpe.

Kate Middleton appeared to have yet move on from the love triangle involving her, Prince William and Isabella Calthorpe. According to Celeb Dirty Laundry, the 33-year-old Duchess won't forget about being called "Waity Katie" before being briefly left so William could reportedly propose to Calthorpe, who is dubbed as the modern-day Camilla Parker-Bowles. The celeb gossip site further claimed that Calthorpe was the Duke of Cambridge's real love and first choice of a wife.

Due to Cressida Bonas' connection to Isabella Calthorpe, Kate Middleton is eager to convince Prince Harry that his ex-girlfriend cannot be trusted. The Duchess is also reportedly freaking out over reports that Harry and Bonas are dating again since she believes that their relationship will be a threat to her marriage, royal life and power.

"She was obviously upset when Cressida and Harry started dating," a source said, as per International Business Times.

The Duchess of Cambridge is also reportedly worried that Bonas may hurt Prince Harry once again as she alleged allegedly initiated the break-up. Thus, Kate told Prince William to warn his younger brother because the Duchess allegedly does not trust Harry's ex-girlfriend.

Kate Middleton's aversion to Cressida Bona, however, does not end in Cressida being "untrustworthy." Ok! Magazine cited that one of the reason that the Duchess hated her was because of the alleged fling between her husband Prince William and Bonas' half-sister, Isabella Calthorpe, who's dating rumors started when the royal couple broke up in 2007, before their royal wedding in 2011.

"Kate doesn't like Cressida at all," a source told the magazine. "It's not just that she thinks Cressida isn't a love match for Harry. It goes deeper than that. She doesn't want her in the family."

The insider also added that Kate Middleton fears that Prince William might realize that Calthorpe was "the one who got away." That's why, the Duchess is allegedly freaking out whenever she hears Isabella's name.

Do you think Prince William will leave Kate Middleton over Isabella Calthorpe? Or do you Prince Harry and Cressida Bonas will rekindle their romance?