Kerr Smith has revealed the reason why not all of his former Dawson's Creek co-stars were interviewed for his memoir.

Several actors from the WB series, including James Van Der Beek - who has since passed away - Katie Holmes, and Michelle Williams gave their thoughts on the iconic show for Kerr's book, I Don't Want to Wait: My Life on Dawson's Creek, but Joshua Jackson, 48, didn't.

When asked why, Kerr - who played Jack McPhee on the show - told E! News: "All I want to say is everybody makes a choice about whether or not they want to be part of the project or not.

"Some did, some didn't."

In the memoir, Kerr insists to Katie that she "positively crushed" a scene in the finale involving her character Joey Potter and Joshua's Pacey Witter, and joked that Joshua would get back to him "any second now".

He wrote: "Allow me to weigh in with my expert analysis. (Yep, I'm now an expert. I mean, have you not heard? I wrote the book on this stuff).

"With all due respect, you're wrong. You positively crushed this scene. Both of you. Right, Josh? Josh? (I'm sure he'll get back to me any second now.)"

Several former Dawson's Creek stars came together online earlier this year to pay tribute to James, after he died in February aged 48.

Kerr, 54, wrote on Instagram: "I'm so grateful for being able to call James a brother. I'll miss him deeply. Rest easy."

Katie also took to social media to pay tribute to James, admitting she will always have "deep gratitude" for having him in her life.

Katie shared a hand-written message on Instagram, in which she wrote: "James, thank you. To share space with your imagination is sacred - breathing the same air in the land of make-believe and trusting that each other's hearts are safe in their expression.

"These are some of the memories, along with laughter, conversations about life, James Taylor songs - adventures of a unique youth …

"Bravery. Compassion. Selflessness. Strength. An appreciation for life and the action taken to live life with the integrity that life is art - creating a beautiful marriage, six loving children - the journey of a hero.

"I mourn this loss with a heart holding the reality of his absence and deep gratitude for his imprint on it."

The Logan Lucky actress - who has 20-year-old daughter Suri with ex-husband Tom Cruise - vowed to be there to support James' widow Kimberly and their six children.

She added: "To Kimberly and the children, we are here for you always. And will always be there to shower you with love and compassion."

Katie, 47, admitted James' death was a "lot to process".

She wrote: "I formed some words with a heavy heart. This is a lot to process. I am so grateful to have shared in a piece of James' journey. He is beloved. Kimberly, we love you and will be here always for you and your beautiful children. [heart emoji]."