Written By: Ben Cosgrove

“Forget the movie, let’s pull the job!”

That, legend has it, is what Frank Sinatra joked upon hearing the plot for Ocean’s 11, the 1960 Vegas heist flick that went on to become the Rat Pack’s signature big-screen adventure.

It’s no wonder Sinatra and his kindred crew of high-living, hard-drinking, skirt-chasing buddies Dean Martin and Sammy Davis Jr., especially were gassed to make such a movie: just like their characters, they loved a good caper. From the late ’50s until they began to splinter apart in the mid-’60s, they were showbiz’s unrivaled kings of swing, quick-with-a-quip cats who could swagger into any joint from the Sands to Sardi’s and make it the most.

[Buy the LIFE book, The Rat Pack: The Original Bad Boys.]

LIFE magazine’s photographers trailed the Pack through those smoky, magical years, coming away with priceless material for some of the best celebrity photo-essays the magazine ever ran. But of the thousands of shots taken, many were never published until now. Here, in celebration of sharkskin sits, Scotch on the rocks, smoke-filled rooms and fedoras tilted just so, LIFE presents a slew of rare photos of the Rat Pack, together and apart, during their boozy heyday.

[MORE: See the gallery, “LIFE With Sinatra: Portraits of ‘The Voice’ in 1965.”]

Frank Sinatra and Dean Martin take a cigarette break during the recording of Sleep Warm in 1958.

Frank Sinatra and Dean Martin Record Sleep Warm

Allan Grant Time & Life Pictures/Getty Images

Dean Martin smokes a cigarette beside his dressing room door backstage before his performance in Las Vegas in 1958. He adjusts his cufflinks.

Dean Martin, 1958

Allan Grant Time & Life Pictures/Getty Images

Frank Sinatra and Dean Martinshare a light moment in the recording studio in 1958.

Frank Sinatra and Dean Martin in the recording studio

Allan Grant Time & Life Pictures/Getty Images

Portrait of Frank Sinatra in cigarette and high ball glass at the Sands Hotel and Casino in 1964. He is wearing a bow tie and tuxedo shirt and sitting on a sofa.

Frank Sinatra at the Sands Hotel and Casino 1964

John Dominis Time & Life Pictures/Getty Images

Frank Sinatra and Joe E. Lewis walk through the kitchen to get to the stage at the Eden Roc Resort in Miami in 1958.

Frank Sinatra and Joe E. Lewis

John Dominis Time & Life Pictures/Getty Images

Sammy Davis Jr. eats spaghetti in his backstage dressing room in Golden Boy. Photographer Leonard McCombe is relected in the mirror.

Sammy Davis Jr. Eats Spaghetti

Leonard McCombe Time & Life Pictures/Getty Images

Sammy Davis Jr. visits Frank Sinatra and Dean Martin at MGM Studios, where the duo were making Some Came Running in 1958.

Dean Martin, Frank Sinatra, and Sammy Davis Jr. on the Set

Allan Grant Time & Life Pictures/Getty Images

Dean Martin entertains on a narrow stage with couples dancing around him in 1958.

Dean Martin On The Cat Walk in 1958

Allan Grant Time & Life Pictures/Getty Images

Frank Sinatra offers a light in Sammy Davis Jr.'s Golden Boy dressing room in 1964.

Frank Sinatra Runs the Party in Sammy Davis Jr’s Golden Boy Dressing Room

John Dominis Time & Life Pictures/Getty Images

Sammy Davis Jr. in Golden Boy

Sammy Davis Jr. in Golden Boy

Leonard McCombe Time & Life Pictures/Getty Images

Sammy Davis Jr. plays with trumpet. The letters S and D hang on the wall behind him.

Sammy Davis Jr. With Trumpet

Leonard McCombe Time & Life Pictures/Getty Images

Sammy Davis Jr. clowns backstage during Golden Boy's run in 1964. He bowtie is untied and his eyes are closed.

Sammy Davis Jr. Clowns Backstage

Leonard McCombe Time & Life Pictures/Getty Images

Sammy Davis Jr. rests on his side with a pillow on the floor of a New York City hotel room. A hotel staff member stands in the background with a room service cart.

Sammy Davis Jr. rests in a New York City Hotel in 1964.

Leonard McCombe Time & Life Pictures/Getty Images

ammy Davis Jr. counts money backstage during Golden Boy' s Broadway run in 1964. He is shirtless and wearing a do-rag.

Sammy Davis Jr. backstage in Golden Boy in 1964

Leonard McCombe Time & Life Pictures/Getty Images

Dean Martin gets a massage at The Sands in Las Vegas in 1958.

Dean Martin gets a massage at The Sands

Allan Grant Time & Life Pictures/Getty Images

Frank Sinatra shaves in a steam room in Miami. He is wearing a towel around his waste and on his head. His face is covered with shaving cream.

Frank Sinatra Steams and Shaves

John Dominis Time & Life Pictures/Getty Images

Frank Sinatra and Dean Martin drive a golf cart at Warner Bros. Studio in 1965 while making Marriage on the Rocks.

Frank Sinatra and Dean Martin, Warner Bros.

John Dominis Time & Life Pictures/Getty Images

Dean Martin and Frank Sinatra crack up during the Sleep Warm sessions in 1958.

Dean Martin and Frank Sinatra Crack Up

Allan Grant Time & Life Pictures/Getty Images

Dean Martin, Sammy Davis Jr., and Frank Sinatra pretend to be drunk on stage for a charity event in 1960.

Frank Sintra, Dean Martin, Sammy Davis Jr. on stage in 1960.

Allan Grant Time & Life Pictures/Getty Images

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