Model Blac Chyna, right, &amp;lt;a href=&amp;quot;http://instagram.com/p/o6yV12xvgT/&amp;quot; target=&amp;quot;_blank&amp;quot;&amp;gt;poses with her pal Kim Kardashian&amp;lt;/a&amp;gt; during what she called a &amp;quot;yay day&amp;quot; on Friday, June 6.