'P.S. I Love You' is finally getting a sequel!

Grab the tissues!

Novelist Cecelia Ahern has finally announced that she has completed a sequel to her debut novel, P.S. I Love You!.

The author has said that she hopes readers will "ugly cry" through the story as much as she did when she was writing it, reported PopSugar.

The follow-up to the hit book, which was adapted into a movie, is titled Postscript and will be published in autumn and catches up on the story of husband and wife, Holly Kennedy and Gerry Clarke.

PHOTO: POPSUGAR

PS I Love You, published in 2004, was about the couple’s relationship and how Holly received ten envelopes after Gerry's death - one for each month after his passing - containing messages from Gerry to his wife, all ending with "P.S. I Love You".

The first book became a Number One best-seller in Ireland and stayed on the book charts for 19 weeks.

Ahern announced the news of the new book on Twitter last week, writing, "I’ve done it. I’ve written the sequel to P.S. I Love You and it’s titled Postscript."

🚨 I have BIG NEWS! 🚨

I’ve written the sequel to PS I LOVE YOU - titled POSTSCRIPT.

POSTSCRIPT will be published September 19th in the UK & Ireland. I hope you’ll welcome back Holly... & Gerry...& that reading it will be as emotional for you as it was for me. 💙#Postscript pic.twitter.com/ldAqLfFpmv

— Cecelia Ahern (@Cecelia_Ahern) March 11, 2019

"It’s the PS to my PS of 15 years ago and writing it has been an emotional experience. I don’t know how I’ve succeeded in keeping this a secret for so long but I’ve been bursting to share it," she added.  "Postscript will be published this autumn. I hope you’ll welcome back Holly...and Gerry...and ugly cry through the story as much as I did."

Hilary Swank and Gerard Butler starred in a film adaptation of P.S. I Love You, which was released in 2007.

Ahern went on to become an award-winning author who has been published in nearly fifty countries, and has sold over 25 million copies of her novels globally.

Have something to add to the story? Share it in the comments below.