Paper Monitor: Just what is this peripheral cleavage?

Quick one today as Paper Monitor has fewer fellow monitorers to help monitor.

So, just a brief thought. Side boobs. What's it all about? Where did they spring from and how did they become the new boob on the block?

First it was RiRi allowing access to her "flanks". Today the Daily Mirror pictures venerable femme fatale Sharon Stone giving good side. "Stone ageless" is the headline. With the picture caption: "She's back: side boob look."

Not content with that the paper's 3AM girls have a whole piece about a Russian model's peripheral cleavage.

"Irina Shayk shows some sideboob on the All Is Lost red carpet in Cannes."

Is this a thing? The mind boggles at where the bosom goes next.