"I've met him before, though, on his party bus," R-Patz said about the Biebs. "I've met him a couple of times. He's all right."
Just because he thought that way during their meeting, doesn't mean Rob doesn't think Justin needs some help.
"When you see these kids, there is only one way: you either get in therapy now or become a serial killer, or kill yourself. I mean, you can see it really early on -- it's terrifying," he added.
Rob started his acting career off at a young age but luckily he was able to have "had a life" before Twilight.
"I did Harry Potter when I was like 17, and nothing really happened after that. I mean, I made loads of money compared to anyone my age -- it was incredible. But I mean, then I just did little TV things afterwards. But I got to live from 18 to 21, you get your own apartment and basically I didn't star in Twilight until 21. It's different because you're still young, but you've had a life beforehand. Where as if you are 10, it's a totally different thing."
R-Patz isn't the only celeb to be impressed with Bieber. Jennifer Lawrence reportedly insisted on meeting him in Cannes last week. Read about that here.
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Gallery | Justin Bieber's Famous BFFs