Here is a nice example of a helmeted and cuirassed VLPP from Siscia with a star on the helmet. These turn up infrequently, as this bust type (D6) usually has a plain helmet. The H11 and H12 (busts with spear & spear and shield) type have stars on the helmet.
Constantine I
A.D. 318-19
18mm 2.7gm
IMP CONSTANTINVS PF AVG;cuirassed bust right wearing laureate helmet with star.
VICTORIAE LAETAE PRINC PERP; two Victories stg., facing one another, together holding shield inscribed VOT PR.
In ex. ESIS
RIC VII Siscia 53
here's another example 19mm 2.5gm