Happy National Sibling Day! (Yes, this actually exists.)

As much as parents would never admit it, there's usually one sibling that they bond with more than the others. The same thing happens in Hollywood as well, but the public is a little more blatant about their preference. There are plenty of super-famous celebrities with brothers or sisters you've never heard of, despite many of them making earnest efforts to get into the public eye. And while they've been able to ride the coattails of their siblings to an acting spot here and there, it's safe to say they won't become bona fide A-listers anytime soon.

Check out our roundup of 11 black sheep celebrity siblings after the jump!

One man’s trash is another man’s treasure! In the world of entertainment, that’s the case when it comes to possible hit songs being passed from one artist to the next, trying to find the perfect fit to turn it into gold.

It was revealed that Justin Timberlake’s “Rock Your Body” (from his debut solo album Justified) was actually never intended for him -– it was for the King of Pop, Michael Jackson. When MJ said “no thanks” to the tune, it landed in JT’s lap and turned out to be a major hit, launching his career as a solo artist. This happens more than you’d think in the music industry, even though it’s hard to imagine another voice on a song that may have jump-started a career or fits that particular artist so perfectly.

Take a look at these eight hit that songs that were actually intended for someone else!