Kylie Jenner has been warned to stay away from Justin Bieber. The reality star, 16, has been told by her dad, Bruce Jenner, to steer clear of the Baby singer.

‘Bruce had thought Justin was hanging out with Kendall, his 18-year-old daughter, with Kylie just tagging along and he was fine with that,’ a source said. ‘But when he learned that Bieber had taken Kylie to Las Vegas to see the Floyd Mayweather Jr. fight, he hit the roof and immediately called estranged wife Kris Jenner, fuming.

‘Bruce then phoned Kylie, forbidding her to date Bieber ever again bluntly declaring her doesn’t want her influence by his drug use and bad behavior. ‘Kylie went crying to Momma, but Kris who’s usually all about the publicity shocked her by siding with Bruce! She totally agrees Justin’s bad news. Kendall and Kylie Jenner are the names above the title on the new novel, ‘Rebels: City of Indra,’ though the youngest members of the Kardashian clan didn’t write it by all themselves (if they even wrote any of it).

An inside page acknowledges that their manager, Elizabeth Killmond-Roman, worked on the book. And she brought in a co-writer, Maya Sloan, who has a few young adult titles under her belt. Four people to write one YA novel with a shopworn plot? Well, we are talking about the Jenners. As in 18-year-old Kendall Jenner who flubbed an introduction at the Billboard Music Awards in May and used dumb chic to explain it away: ‘I’m the worst reader ever.’ And her 16-year-old sister, Kylie, is the one who convinced her mother Kris Jenner to homeschool them because all her social engagements put her woefully behind in school.