Tough one as there is no last name plus a lot of skips due to the paint pen not adhering properly to the surface. If you trust the source it might be worth taking a chance on this one as Stevie rarely signs anymore except for charity. And if a miracle happens and she does sign for you it will likely be personalized. I'd guess a value would be in the $200 range.
Honestly, even if this is authentic it would not be one to invest heavily in. I would not approach this one unless it was priced very low. My advise would be pass on this one and find a better example.