Kate Middleton Pippa Middleton
Kate Middleton apparently is not a fan of Pippa Middleton's future brother-in-law Spencer Matthews Reuters

Kate Middleton is allegedly unhappy about Pippa Middleton's engagement with hedge fund manager James Matthews. The Duchess of Cambridge apparently does not like James' younger brother, Spencer Matthews.

The Made In Chelsea star has been widely accused of snorting cocaine. Adding on, he had once boasted that he lost his virginity at 13 and has bedded 1,000 women.

According to Life & Style magazine, Prince William's wife has a problem with his bad boy image. An alleged source said: "[Kate] is horrified about Spencer being Pippa's brother-in-law."

"Spencer has slept his way around London and left a lengthy trail of angry women in his wake," another insider told the publication. "Kate's concerned. The last thing she wants is for William's family to turn against her because of Spencer's actions."

Meanwhile, Pippa is over the moon following her engagement to Matthews.The 40-year-old reportedly asked Pippa's father permission before proposing. A source told Dailymail: "James is a traditionalist and very much wanted to do things properly. That meant getting his future father in law's consent."