Here are some folks with their footprints at Grauman's with
Lucy connections:  (Thanks to Kathy Schwartz for the names.)  

Abbott & Costello      Lucy was in "Abbott&Costello Go to Hollywood"
Fred Astaire           Lucy in four Astaire movies
Jack Benny             Close friend and neighbor
Joan Blondell          Her sister Gloria was Grace Foster
Charles Boyer          In an I Love Lucy
Eddie Cantor           He said "let that girl do it" about Lucy
Maurice Chevalier      In I Love Lucy episode
Gary Cooper            Lucy impersonated him for Carolyn
Bette Davis            Lucy wanted her for "The Celebrity Next Door"
James Doohan           Star Trek made possible by Lucille Ball
Clint Eastwood         His ex-girlfriend Francis Fisher portrayed 
                         Lucy in a movie
Henry Fonda            Two movies together
Clark Gable            Lucy impersonated him 
Ava Gardner            Not like you and me
Betty Grable           On a Lucy Desi Comedy Hour
Cary Grant             Lucy and Ethel spotted him at the Brown Derby          
Van Heflin             His wife appeared in "The Fashion Show"
Bob Hope               Close friend, appeared on I Love Lucy
Rock Hudson            In Palm Springs on I Love Lucy
Van Johnson            The Dancing Star on I Love Lucy
DeForest Kelley        No Trek without Lucille Ball
Walter Koenig          No Trek without Lucille Ball
Alan Ladd              His wife was in "The Fashion Show"
James Mason            In "Forever Darling"
Marx Bros.             Lucy in "Room Service"; Harpo on I Love Lucy
Carmen Miranda         Lucy did a great imitation
Marilyn Monroe         Mentioned often on ILL
Nichelle Nichols       No Trek without Lucille Ball
Leonard Nimoy          No Trek without Lucille Ball
Jack Oakie             Annabel movies
Gregory Peck           Paged at the Brown Derby
Ginger Rogers          In five movies together
William Shatner        No Star Trek without Lucy
Red Skelton            Close friend, appeared on a Lucy Desi Comedy Hour
George Takei           No Star Trek without Lucille Ball
Elizabeth Taylor       Lucy got Liz' diamond stuck on her finger
Danny Thomas           In a Lucy/Desi Comedy Hour
Rudy Vallee            In a Lucy/Desi Comedy Hour
John Wayne             Lucy Ricardo stole his footprints!
Richard Widmark        Appeared on an I Love Lucy


More?