while I can't say that the signatures are real or fake as I have never sold signatures by these three, there is something here that all dealers like myself (with any skill in this area.) look at- they are all signed with the same pen, and usually, that doesn't happen. Unless there was a signing function with DeCaprio, Cameron and Winslet all sitting next to each other at one table, you just don't use the same pen. That of course precludes each person sitting with their own Flair pen.
as to value, if authentic $100-150 at retail, or $1000 in one of those shopping mall stores where 95% of everything they have really is fake