Songs About Chelsea

Have you guys noticed that there are a ton of songs about a girl named Chelsea?
Who is this chick and why does she know so many guys in bands?

The Killers: Mr. Brightside 
The Summer Set: Chelsea
The Fratellis: Chelsea Dagger
Stefy: Chelsea
Bring Me The Horizon: Chelsea Smile
Blossom Dearie made an entire album about Chelsea: Songs Of Chelsea
and then you have the band Chelsea Grin

If you guys think of more feel free to comment!