What 21st Century marketing tools can tell you
From Twitter:
Do Kelly Osbourne and Brandi Cyrus
Live next to each other?

At 7 p.m., Sept. 29, 2010, Kelly Osbourne tweeted: There is a rainbow out side my house and it's soooo beautiful!!!! http://plixi.com/p/47873531

At the same time, Brandi Cyrus, daughter of Billy Ray and half-sister (non-biological, but it's a long story) to Miley, tweeted: There's currently a double rainbowwww in my backyard!

There's also the possibility they live near Nick Cannon and Mariah Carey:
did anyone else in la see the double rainbow today? Very amazing : )

Derek Hough
There was even a "double rainbow".. Ha ha !! What died it mean , it's so beautiful ;) ha!!!

Potty mouth Tweeter David Cook
Holy hell! There's a double rainbow in LA!

Don't know who she is, but her Twitter picture looks fine, Double Rainbow!!! It's so vivid!!! http://yfrog.com/jvbo8ioj

Ryan Seacrest and Ellen DeGeneres did not mention it, so it can't be real - or they are not Brandi and Kelly's neighbors.