Fans feted the Chamberlain Tuesday during the opening night of "Spamalot" at the Palace Theater in Cleveland.
After the curtain fell, the audience rose to its feet and sang "Happy Birthday" while a fellow cast member presented Chamberlain with a cake on stage.
Chamberlain starred as the heartthrob in 1960s TV series "Dr. Kildare." His recent TV credits include appearances on "Will & Grace," "Desperate Housewives" and "Nip/Tuck."
The stage veteran plays King Arthur in the touring musical based on the movie "Monty Python and the Holy Grail."
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