So its Arwins favorite Jailbait girl (he does love his blondes) Miss Olivia Holt.
As you should already know, Olivia is from Disney XDs Kickin It.
She is cute, but I dont think shes gonna get very popular as long as shes stuck on DXD. No one ever watches that channel. xD
Still, shes got some tallent so well see how it goes. 
Click any pic to see the full set.