Roger Daltry & Pete Townshend from the Who are both 2's.
They appeared with Jack Nicholson in Tommy
Jack appeared with Kevin in A Few Good Men
Bruce Dickinson of Iron Maiden is a 3.
Bruce appeared with Simon Callow in Chemical Wedding
Simon appeared with Dianne Wiest in Merci Docteur Rey
<getting strenuous here>
Dianne appeared with Kevin in Footloose
Gene Simmons of KISS is a 2.
Gene appeared with Illeana Douglas in The New Guy
Illeana appeared with Kevin in Stir Of Echoes
Paul Stanley of KISS is a 3.
Paul appeared with Ozzy Osbourne in The Decline Of Western Civilization
Ozzy appeared with James McAvoy in Gnomeo & Juliet
James appeared with Kevin in X-Men: First Class
(Kevin was in that?)