Kim Kardashian West has been ''really supportive'' of Kylie Jenner.

The 17-year-old television personality recently revealed she felt as though she had been bullied by ''the whole world'' since she was nine-years-old and older half-sister Kim is said to have been offering her advice on how to deal with the haters.

A source told HollywoodLife.com: ''Kim has been really supportive of Kylie and has been more like a mom to her than a big sister.

''She knows how sensitive Kylie is and especially how tormented she gets after reading hurtful comments on the Internet. Kim's advice is simple, 'Don't read the comments.' This is something she knows from first-hand experience.''

Kylie revealed her bullying woes in a frank video posted on picture-sharing site Snapchat.

She said: ''It's kind of crazy I have four million people watch my Snapchats. Half of you guys think I'm weird, and the other half think I'm funny.

''But I've been bullied since I've been nine. From the whole world, it feels like sometimes... and I think that I've done a really great job in handling all this.

''There are bullies everywhere. So, this was just a little like Snapchat, to tell whoever with their own bullies, that the only opinion that ever really matters is yours and to never change.''