Millie Bobby Brown looks glamorous as she cozies up to

Millie Bobby Brown looks glamorous as she cozies up to her fiancé Jake Bongiovi at the launch of her new book Nineteen Steps in London

Millie Bobby Brown looks glamorous as she cozies up to her fiancé Jake Bongiovi at the launch of her new book Nineteen Steps in London

Millie Bobby Brown looked typically stylish as she arrived hand-in-hand with fiancé Jake Bongiovi at the book launch of her debut novel Nineteen Steps on Tuesday.

The 19-year-old actress and Jon Bon Jovi’s 21-year-old son tried their best to take shelter from the rain and looked cozy under an umbrella as they entered the Hackney Empire in London.

Millie, who got engaged to Jake in April, cut a glamorous figure in an off-the-shoulder black crop top, which she cleverly tucked into black trousers.

She highlighted her enviable figure with black strappy heels and showed off her new long brunette hair extensions in a chic slicked-back style.

Meanwhile, Jake looked suave in a beige linen shirt and pants paired with white sneakers as he appeared as close as ever to his new fiancée.

Glamourous: Millie Bobby Brown looked typically stylish as she arrived hand-in-hand with fiancé Jake Bongiovi to the book launch of her debut novel 'Nineteen Steps' on Tuesday

Glamourous: Millie Bobby Brown looked typically stylish as she arrived hand-in-hand with fiancé Jake Bongiovi to the book launch of her debut novel ‘Nineteen Steps’ on Tuesday

Staying hidden: The 19-year-old actress and Jon Bon Jovi's 21-year-old son tried their best to seek shelter from the rain, staying close under an umbrella as they entered the Hackney Empire in London

Staying hidden: The 19-year-old actress and Jon Bon Jovi’s 21-year-old son tried their best to seek shelter from the rain, staying close under an umbrella as they entered the Hackney Empire in London

Nineteen Steps, out September 12, is a historical novel about a courageous 18-year-old named Nellie Morris, who lives with her family in Bethnal Green in London’s East End while World War II rages around her.

When a tragic accident occurs during an air raid one night, the consequences are catastrophic – and for Nellie, life will never be the same again.

“Writing Nineteen Steps was a very special project for me. “The story is inspired by true events and my own family history,” she explained while showing a photo of herself and her grandmother.

In a statement released through publisher William Morrow, the Screen Actors Guild Award winner revealed a few more details about her personal connection to the story, according to The Hollywood Reporter.

“Inspired by my Nanny Ruth, this book is very personal and close to my heart,” said Millie.

“I grew up hearing stories about their time during the war. It’s an honor to keep her story alive.”

Millie and her fiancé Jake got engaged earlier this year after two years of dating and announced the news with a sweet Instagram post.

The star recently revealed in a candid interview that she has started planning her wedding and it’s “so much fun.”

Chic: Millie looked stylish in an off-the-shoulder black crop top, which she tucked neatly into black trousers

Chic: Millie looked stylish in an off-the-shoulder black crop top, which she tucked neatly into black trousers

Stunning: She highlighted her enviable figure with black strappy heels and showed off her new long brunette hair extensions in a chic slicked-back style

Stunning: She highlighted her enviable figure with black strappy heels and showed off her new long brunette hair extensions in a chic slicked-back style

Supportive: Meanwhile, Jake looked suave in a beige linen shirt and pants, paired with white sneakers

Supportive: Meanwhile, Jake looked suave in a beige linen shirt and pants, paired with white sneakers

In an interview with Women’s Wear Daily last month, she expressed her excitement about getting engaged to Jake and planning their wedding together.

The star also mentioned that she prefers to keep her life private as she prefers to save the special moments for herself.

She said of her upcoming big day: “I can say the planning is underway. “It’s so much fun. And it’s such an exciting time in my life.’

“It just feels unnatural to me to have everyone’s opinions and eyes on it,” she said of wedding planning.

“That’s why I think it’s important to keep these things – these little, precious moments in life – really close to your chest.”

Sweet: Millie and her fiancé Jake Bongiovi, 21, son of Jon Bon Jovi, recently got engaged after two years of dating

Sweet: Millie and her fiancé Jake Bongiovi, 21, son of Jon Bon Jovi, recently got engaged after two years of dating