I don't think this is authentic :\
I had a signed copy of her album imported from the UK (play.co.uk presale) for Christmas and the signatures look nothing alike
Autographs Recieved: Coco Jones, Ariana Grande, R5, Melissa Joan Hart, Kelly Clarkson, Sammi Giancola Waiting on: Ariana Grande, Amanda Seyfried, Carly Rae Jepsen
Have to agree, the T is near on identical, and the rest looks like a hurried version (on the cd I mean). It's worth noting that Play.com signed items are signed in a flash, and the quality goes downhill quickly, especially for those who don't give a toss about their fans as long as money is spent.