Livid Lionel! Sophia Richie's Dad Demanding A Sit-Down With 'Terrified' Justin Bieber

From womanizer, to party prince, Justin Bieber has the potential of becoming every dad's worst nightmare, but especially for one: Sophia Richie's dad, Lionel.

Ever since the music mogul's daughter's been shacking up with the Biebs, "everyone's saying Sophia is going to be wilder than her older sister Nicole ever was," a friend told Now, and Lionel's concerned.

"Overnight Sofia's become the life and soul of every part in town," the insider added. "Party King Justin's escorting her to some of the wildest bashes in the Hills and she's having the time of her life. He's definitely leading her astray."

"Lionel is very protective of Sofia. She's his baby girl," the source revealed. "When she started dating Justin, she promised her dad they were just friends and nothing more. But obviously that's not true now and Lionel is demanding a sit-down with Justin."

And Justin's "terrified" at the prospect, but Lionel isn't backing down, and wants answers. "This is a reluctant meeting, but it's going to have to happen now. Everyone's worried Justin's leading Sofia down a bad path," the source explained.

How do you think their meeting's going to go? Let us know in the comments section!