That is nice to see!
One thing to note is that the photographer owns the rights to the pictures, and you can also take into account the licensing use. It could be that Alizée does not have the rights to the images. . . . there could be model releases signed, too, etc.
If it would've been a fan's photo of her smiling face used for any advertisement, then there would've been issues.
Anyhoot, if you had a sticker made ( use your printer, and buy the labels in any arts/crafts or Wall Mart store) you could simply walk by the sign and slap that sticker on there
