Photo Via John Wall on Twitter
That may be Wall's custom jersey (pictured below) that he received from DC United player Chris Pontius. The jersey has a #2 on the back and even says 'Wall'. United saw an earlier report about Wall wearing a NY Red Bulls jersey, so they decided to give him his own DC jersey.
Photo Via DC United
If you were wondering who the girl in the photo is, it is Phoenix, who is a singer with Maybach Music Group. (maybach music (echo) ) Check the vid if u care: