Question: Which film starred an informal group of entertainers centered on the Las Vegas casino scene and was directed by Lewis Milestone?

Context paragraphs:
Dangerous Innocence: Dangerous Innocence was a 1925 American silent romantic comedy/drama film written by Lewis Milestone and James O. Spearing based upon the novel "Ann's an Idiot" by Pamela Wynne.  Directed by William A. Seiter for Universal Pictures, the film starred Laura La Plante and Eugene O'Brien.  The film's status is currently unknown, any copies of this film exist, and it is now considered lost.

The North Star (1943 film): The North Star (also known as Armored Attack in the US) is a 1943 war film produced by Samuel Goldwyn Productions and distributed by RKO Radio Pictures.  It was directed by Lewis Milestone, written by Lillian Hellman and featured production design by William Cameron Menzies.  The film starred Anne Baxter, Dana Andrews, Walter Huston, Walter Brennan and Erich von Stroheim.  The music was written by Aaron Copland, the lyrics by Ira Gershwin, and the cinematography was by James Wong Howe.  The film also marked the debut of Farley Granger.

Madame Tussauds Las Vegas: Madame Tussauds Las Vegas is a wax museum located in the Las Vegas Strip at The Venetian Las Vegas casino resort in Paradise, Nevada.  The attraction opened in 1999, becoming the first Madame Tussauds venue to open in the United States.  It features over 100 wax figures of famous celebrities, film and TV characters, athletes, musicians and Marvel superheroes, as well a 4D movie theatre.  Subsequent Madame Tussauds venues opened in the U.S in New York City in 2000, Washington D.C. in 2007, and Hollywood, California in 2009.

Tropicana – Las Vegas Boulevard intersection: The Tropicana – Las Vegas Boulevard intersection on the Las Vegas Strip (Tropicana Avenue and Las Vegas Boulevard), is noteworthy for several reasons.  It was the first intersection in Las Vegas completely closed to street level pedestrian traffic and its four corners are home to four major resorts: Excalibur Hotel and Casino, Tropicana Las Vegas, New York-New York Hotel and Casino and MGM Grand Las Vegas—the latter has 5,044 rooms and was once the largest hotel in the world.  The resorts at the four corners have a total of 12,536 hotel rooms as of 2016.

Frank Rosenthal: Frank Lawrence "Lefty" Rosenthal (June 12, 1929 – October 13, 2008) was a professional sports better, former Las Vegas casino executive, and organized crime associate.  Martin Scorsese's film "Casino" (1995) is based on his career in Las Vegas.

Fabrizio Boccardi: Fabrizio Boccardi is an Italian American entrepreneur, investor, and producer.  Boccardi is the owner and creator of the multimedia brand the Tyrant.  In addition, he controls several investments,including Media, technology, and Gaming in the United States and abroad.  Boccardi has attempted to buy control of a Las Vegas casino, most notably Riviera Holdings, former owner of the Riviera Hotel & Casino on the strip of Las Vegas, and Riviera Casino in Black Hawk Colorado.

Holy Cow Casino and Brewery: Holy Cow!  Casino and Brewery (formerly Foxy's Firehouse) was a locals casino and microbrewery on South Las Vegas Boulevard, north of the Las Vegas Strip, in Las Vegas, Nevada.  The property began in 1955 as Foxy's Deli, which operated until its closure in 1975.  A year later, the building was reopened as a casino named Foxy's Firehouse, which later closed in 1988.  Tom "Big Dog" Wiesner purchased the building and reopened it as the Holy Cow casino in 1992.  Wiesner added a microbrewery the following year, making the Holy Cow the first brewery to open in Las Vegas.  Wiesner persuaded the state to change its laws that had prohibited breweries from operating in Las Vegas.

The D Las Vegas: The D Las Vegas Casino Hotel is a 34-story, 638-room hotel and casino in Downtown Las Vegas Nevada, owned and operated by Derek and Greg Stevens.

Ocean's 11: Ocean's 11 is a 1960 heist film directed by Lewis Milestone and starring five Rat Packers: Peter Lawford, Frank Sinatra, Dean Martin, Sammy Davis, Jr. and Joey Bishop.

Rat Pack: The Rat Pack is a term used by the media to refer to an informal group of entertainers centered on the Las Vegas casino scene.  Having its origins in a group of friends that met at the Los Angeles home of Humphrey Bogart and Lauren Bacall, by the 1960s, it was the name used by the press and the general public to refer to a later variation of the group that called itself "the Summit" or "the Clan", featuring Frank Sinatra, Dean Martin, Sammy Davis Jr., Peter Lawford and Joey Bishop among others; they appeared together on stage and in films in the early 1960s, including the movies "Ocean's 11", "Sergeants 3", and "Robin and the 7 Hoods" (in the last film, Bing Crosby replaced Lawford).  Sinatra, Martin, and Davis were regarded as the group's lead members.

Supporting paragraphs: Rat Pack Ocean's 11
Answer: Ocean's 11