Frank Sinatra's first wife and childhood sweetheart, Nancy Barbato Sinatra, died at the age of 101 in her sleep on July 13, 2018.

In a heartfelt Twitter post, her daughter, Nancy, wrote: "My mother passed away peacefully tonight at the age of 101. She was a blessing and the light of my life. Godspeed, Momma. Thank you for everything."

Frank and Nancy Sr. met when they were teenagers in Long Branch, New Jersey, and they quickly fell in love.

Five years later, in 1939, just before Frank's legendary singing career took off, the two tied the knot at a church in New Jersey.

During that time, Nancy Sr. worked as a secretary and Frank worked as a singing waiter.

The couple welcomed three kids: Nancy, Frank Jr., and Tina.

A little over a decade after they got married, the couple called it quits when Frank had an affair with actress and singer Ava Gardner.

Frank went on to marry three more times, while Nancy Sr. never remarried.

Despite being divorced, the two were close until Frank passed away from a heart attack in 1998.

For most of Nancy Sr.'s life, she lived in Beverly Hills focused on her charity work.

On the Sinatra Family website, the family posted a heartfelt tribute to their late mother. And below the message, they linked Frank's famous song "She's Funny That Way."

In another Twitter post, the couple's first child, who sang the '60s hit "These Boots Are Made For Walkin'," thanked everyone for their thoughtful messages of condolences.

"Our mother was a fighter until the end when her brave, loving heart gave out," Nancy wrote.

Nancy Sr. is survived by her sister, daughters, grandchildren, and great-grandchildren. Unfortunately, her son, Frank Jr., passed away from cardiac arrest in 2016.

RIP Nancy Sinatra Sr. You will be missed.

[H/T: Global News]

How well do you know Frank Sinatra? Here are 10 facts about Ol' Blue Eyes that'll make you miss the singing legend.