Steve Martin has fathered his very first child ... at the ripe age of 67-YEARS-OLD ... this according to a new report.
The "Pink Panther" star's 41-year-old wife Anne Stringfield gave birth to the kid back in December ... so says the New York Post.
So far, Martin and his wife have not commented on the story.
Steve wouldn't be the first celebrity dad to father a kid in his 60s ... Rod Stewart did it (66 years old) ... so did Pablo Picasso (67) and Clint Eastwood (66).
And ... Charlie Chaplin had a kid when he was 73.