Steve Martin starred in "Parenthood" and the "Father of the Bride" films, but he didn't become a daddy until the age of 67.
And the comedian is taking his new role very seriously.
Appearing on "The Late Show With David Letterman" Tuesday night, Martin plunked a baby monitor on the talk-show host's desk, saying, "I'm a responsible (dad)."
The men listened in as the remote device picked up sham sounds from his "baby back at the hotel" -- including a car alarm, a barking dog, coughing, and the baby playing the banjo.
Like father, like daughter: Martin just showed off his banjo skills on TODAY on Monday, promoting his new musical collaboration with New Bohemians singer-songwriter Edie Brickell.
When Letterman asked about his experience as a parent, Martin praised his wife of nearly six years, Anne Stringfield.
"It's going great because I have a wonderful wife and mother," he enthused, which drew chuckles from the host and his audience.
"I'm paying her a compliment," he insisted. "Everything is funny when I try to be serious!"
The notoriously private musician, author, producer and movie star deftly deflected Letterman's question about his daughter's name, teasing that they've considered a very unique choice: Conquistador.
"We've thought about the name quite a bit. Conquistador. What do you think? I didn't want to go with one of those Hollywood ... weird names," he deadpanned.
"Conquistador is a statement."
At least he didn't name her Navin!