The Morning Show star Billy Crudup spent some quality time with his much taller son William Atticus Parker while walking down the streets of New York City together on Wednesday.

The 21-year-old nepo baby appeared to be several inches taller than the 5ft9in Emmy winner, who celebrated his 57th birthday on Tuesday.

According to IMDb, William cast Billy to play a mystery role in his upcoming third feature directorial effort The Auction alongside his mother Mary-Louise Parker as well as Audra McDonald, Richard Kind, and Raúl Castillo.

Parker wrote and produced the ‘wild’ indie sci-fi horror spectacle about a corporate auction company, which is a loose adaptation of Agatha Christie’s 1939 mystery novel And Then There Were None.

The River Styx Productions founder also enlisted his 18-year-old sister Ash Parker, whom the 60-year-old Emmy winner adopted from Ethiopia in 2007, to compose an original song for The Auction.

Readers might recall how Mary-Louise was seven months pregnant with William in November 2003 when Crudup left her for his Stage Beauty leading lady Claire Danes after they fell in love on set months earlier.

The Morning Show star Billy Crudup (R) spent some quality time with his much taller son William Atticus Parker (L) while walking down the streets of New York City together on Wednesday

In her 2015 memoir Dear Mr. You, Parker wrote a thinly-veiled chapter inspired by that time period when got kicked out of a taxi after angering the lost driver, who told her: ‘I don’t want you any more.’

‘No one does. Look at me. My life is worse than yours in this moment. I am alone. Look, see? I am pregnant and alone. It hurts to even breathe,’ the Weeds alum wrote.

‘I’m trying to get through it but I’m by myself every night and every morning and no one, nothing helps. I’m sorry I yelled. I can’t get my shoes on anymore. Please, I know I am awful, it’s been made clear but look at me please.’

Mary-Louise concluded of their seven-year romance: ‘I realize now that whatever I was walking through was part of my life, one piece of a bigger story that is mostly beautiful.’

And in 2009, Parker directly addressed the scandal in More Magazine: ‘I’ve never commented on the situation, and I won’t because it’s not fair to my son. Your love for your child should eclipse any other feelings you have for another person.’

On April 7, Billy and Claire enjoyed an affectionate reunion at Cipriani South Street in Lower Manhattan during the NYU Tisch Gala, which raised over $1.7M in support of student needs.

‘I was just in love with him. And needed to explore that and I was 24. I didn’t quite know what those consequences would be,’ Danes admitted on The Howard Stern Show in 2015.

‘[The backlash] was a scary thing. That was really hard. I didn’t know how to not do that. It’s OK. I went through it. We’re friendly — we’re friends.’

The Homeland alum has been married to her Stardust leading man Hugh Dancy since 2009 and Crudup has been married to his Gypsy leading lady Naomi Watts since 2023.

The 21-year-old nepo baby appeared to be several inches taller than the 5ft9in Emmy winner, who celebrated his 57th birthday on Tuesday

According to IMDb, William cast Billy to play a mystery role in his upcoming third feature directorial effort The Auction alongside his mother Mary-Louise Parker

Parker wrote and produced the ‘wild’ indie sci-fi horror spectacle about a corporate auction company, which is a loose adaptation of Agatha Christie’s 1939 mystery novel And Then There Were None (pictured June 26 with his mother Mary-Louise Parker)

Audiences can stream William’s self-funded, second feature directorial effort Atrabilious on Amazon Prime Video starting July 18.

The $20K-budget neo-noir – which wrapped production in 2022 – stars Leon Addison Brown, Jeffrey Wright, Whoopi Goldberg, Alec Baldwin, Lewis Black, and Mark Boone Junior.

‘I’m so proud of the film,’ Parker gushed on September 24.

‘The cast and crew did such incredible work in 11 days. I’m forever thankful. I can now say with certainty that Atrabilious will be coming soon.’

Readers might recall how Mary-Louise was seven months pregnant with William in November 2003 when Crudup left her for his Stage Beauty leading lady Claire Danes (L) after they fell in love on set months earlier

And in 2009, the Weeds alum directly addressed the scandal in More Magazine: ‘I’ve never commented on the situation, and I won’t because it’s not fair to my son. Your love for your child should eclipse any other feelings you have for another person’ (pictured in 2002)

The True West thespian will play a mystery role in Katie Aselton’s teen romance Their Town alongside Daveed Diggs, Ora Duplass, and Chosen Jacobs.

William previously acted in five of Mary-Louise’s projects – Woody Woodpecker Goes to Camp (2024), Colin in Black & White (2021), Mr. Mercedes (2017-19), Compliance (2018), and Christmas in Conway (2013).

In 2022, Parker enlisted his famous godmother Susan Sarandon to star in his $5K-budget feature directorial debut, Forty Winks.

The Brooklynite’s middle name was inspired by the To Kill a Mockingbird character Atticus Finch.