Mark Harmon and 'NCIS' Cast Celebrate TV Guide Magazine Cover and 15 Seasons on Television (PHOTOS)

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Mark Harmon
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Mark Harmon signs his TV Guide Magazine cover celebrating 15 years of NCIS.

Maria Bello
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Actress Maria Bello attends the TV Guide Magazine Cover Party for Mark Harmon and 15 seasons of the CBS show NCIS at River Rock at Sportsmen’s Lodge on November 6, 2017 in Studio City, California.

Maria Bello and Mark Harmon
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Co-stars Maria Bello and Mark Harmon attend the TV Guide Magazine Cover Party for Mark Harmon and 15 seasons of the CBS show NCIS at River Rock at Sportsmen’s Lodge on November 6, 2017 in Studio City, California.

NCIS Cover Party
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Actress Laura San Giacomo attends the TV Guide Magazine Cover Party for Mark Harmon and 15 seasons of the CBS show NCIS at River Rock at Sportsmen’s Lodge on November 6, 2017 in Studio City, California.

Mark Harmon and Laura San Giacomo
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Mark Harmon and Laura San Giacomo share a warm embrace.

Brian Dietzen
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Actor Brian Dietzen attends the TV Guide Magazine Cover Party for Mark Harmon and 15 seasons of the CBS show NCIS at River Rock at Sportsmen’s Lodge on November 6, 2017 in Studio City, California.

Mark Harmon
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Smile for Mark’s camera!

Emily Wickersham
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Emily Wickersham attends the TV Guide Magazine Cover Party for Mark Harmon and 15 seasons of the CBS show NCIS at River Rock at SportsmenÕs Lodge on November 6, 2017 in Studio City, California.

Sean Murray
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Actor Sean Murray attends the TV Guide Magazine Cover Party for Mark Harmon and 15 seasons of the CBS show NCIS at River Rock at Sportsmen’s Lodge on November 6, 2017 in Studio City, California.

Tony Frost, Maria Bello, Mark Harmon and David Jackson
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(L-R) Tony Frost of TV Guide Magazine, Maria Bello, Mark Harmon and David Jackson of TV Guide Magazine attend the TV Guide Magazine Cover Party for Mark Harmon and 15 seasons of the CBS show NCIS at River Rock at Sportsmen’s Lodge on November 6, 2017 in Studio City, California.

Joe Span
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Actor Joe Spano attends the TV Guide Magazine Cover Party for Mark Harmon and 15 seasons of the CBS show NCIS at River Rock at Sportsmen’s Lodge on November 6, 2017 in Studio City, California.

Wilmer Valderrama
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Actor Wilmer Valderrama attends the TV Guide Magazine Cover Party for Mark Harmon and 15 seasons of the CBS show NCIS at River Rock at Sportsmen’s Lodge on November 6, 2017 in Studio City, California.

Rocky Carroll
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Actor Rocky Carroll attends the TV Guide Magazine Cover Party for Mark Harmon and 15 seasons of the CBS show NCIS at River Rock at Sportsmen’s Lodge on November 6, 2017 in Studio City, California.

NCIS Cover Party - Johnathan Fernandez
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Lethal Weapon star Johnathan Fernandez and his wife attend the TV Guide Magazine Cover Party for Mark Harmon and 15 seasons of the CBS show NCIS at River Rock at Sportsmen’s Lodge on November 6, 2017 in Studio City, California.

Duane Henry
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Actor Duane Henry attends the TV Guide Magazine Cover Party for Mark Harmon and 15 seasons of the CBS show NCIS at River Rock at Sportsmen’s Lodge on November 6, 2017 in Studio City, California.

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NCIS star Mark Harmon was joined by his co-stars and friends at the River Rock at Sportsmen’s Lodge in Studio City, California, on Monday, November 6, 2017, to celebrate the show's 15 seasons on television and the actor's TV Guide Magazine cover. To catch Harmon's exclusive interview with TV Guide Magazine, pick up the Nov. 13-26 double issue on newsstands Nov. 9.

NCIS, Tuesdays, 8/7c, CBS

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