Kim Kardashian may be one of the most self-concerned people in Hollywood (have you heard of her selfie book?), but she's a good sister to the youngest of the brood -- Kendall and Kylie.

Considering that she's spent her entire adult life in the spotlight, she definitely knows how it feels like to have the whole world set its eyes on you. Apparently, she's certain that her sisters, who had cameras on them since they were kids, have stardom under control.

When Access Hollywood interviewed the reality star, she was asked about having any concerns for her sisters knowing about "normal" life.

The outlet's host, Billy Bush, asked Kim, "You went to school. You went to gym class. You had some of those experiences. Does part of you have concern for the fact that the girls are kind of just born right into it?"

Kim answered, "I think that is just their reality. But they know when things are normal. They know that all their friends aren't going on private jets. They know that they are growing up with a life of privilege, but they are super grounded and responsible."

At this point, 17-year-old Kylie has not denied about having lip fillers, and this is one thing Kim addressed in the dialogue.

She also defended her sister for not attending school, "She talks about this all the time herself -- she's always with her friends and having fun and people would question, 'Are you going to school?' She goes to school. She's home-schooled. She has a year left. She goes to school every single day."

And for the lip fillers, she said that they made sure Kylie knows when to draw the line. She shared with Billy, "I think there are limits and there are boundaries, for sure. I think that you have to know the difference. She did something that made her feel better about herself and that's kind of where you have to draw the line, and she knows that."

As previously reported, Kylie actually encouraged people and young girls to "not be afraid" with experimenting on their looks. Regarding her lips, the youngster claims she never lied, but might have "tiptoed" around the truth.

However, the older Kardashians expressed concern regarding their youngest sister, as seen in an episode of "Keeping Up With The Kardashians", Mirror UK said.

Even 19-year-old Kendall expressed her concern, saying, "She got a little crazy. Right you guys, sure, at first, you've seen them in person. When she first got them done they were great. They were fine, they were perfect size and they looked natural."

What do you think about the Kardashians' relationship with each other, specially their concern over family members? Should Kim be more worried for her younger sisters, or should she just let them be?