I believe there is a total to date of 12 different Legends of Hollywood stamps. If I'm not mistaken, only the first 4 of the 12 in the series are water activated. Only these 4 and not the self adhesive ones, have star shaped perforations on the 4 corners of each stamp. Someone please correct me if I am wrong on any of these details.
The star shaped perfs are not all that obvious unless you have a block of 4, or one or more of the selvage stamps. The scan is not a great example but the star perf is clear. Marilyn Monroe, scott 2967, is the first in the series. It is a very attractive perf shape but unfortunately, short lived.

Marty