Barbara Mandrell & her whole gun-totin', trap-shootin', country/western-singin' family. IIRC, Barbara's estate that recently sold included a fully-equipped indoor range! Yee-haw!
edited to add:
Yeah, I know she isn't "Hollywood," but neither is Toby Keith (listed above). And I saw Kid Rock, but did anybody mention Hank Williams, Jr.? Bocephus has his own working Civil War era cannon, in addition to a very envious and Ruger-heavy collection of "conventional" firearms...