I was highly suspicious when it first appeared without the photo. But now the photo is there, I'd say it was authentic. It does match up very well with known authentics. I actually bought a Jessica Biel autograph from autographworld a while back, as I knew she didnt sign TTM. Ironically, its the same photo as that member posted, but if you compare the auto -
http://www.andy316.fpic.co.uk/p38270666.html - its almost a perfect match.
Although having said that, in the space of a about a week, authentic successes have been reported from Johhny Depp, Hugh Jackman and now Jessica Biel.
Normally seeing one of those a year would be a surprise, but all 3 in the space of a week is madness. Think its 3 seperate members reporting them, and all 3 hold up well, but its just weird.
Now going back to Biel, while I do believe the autograph to likely be authentic, that doesnt mean it was actually obtained TTM. I keep looking at it, and the "To Sean" part seems on a different "line" to the autograph. Pretty much all inscriptions are in line with the autographs, whereas this looks like it was done at 2 seperate times.
I would say either -
1) He faked it himself, and did a very good job of faking the autograph.
or
2) He bought the autograph, and added the personalisation himself.
I would say he probably didnt get it TTM though.