The 1940s was the decade that started on January 1, 1940, and ended on December 31, 1949. This was the fifth decade of the 20th century.

The Second World War took place in the first half of the decade, which had a profound effect on most countries and people in Europe, Asia and elsewhere. The consequences of the war lingered well into the second half of the decade, with a war-weary Europe divided between the jostling spheres of influence of the West and the Soviet Union. To some degree internal and external tensions in the post-war era were managed by new institutions, including the United Nations, the welfare state and the Bretton Woods system, providing to the post–World War II boom, which lasted well into the 1970s. However the conditions of the post-war world encouraged decolonialization and emergence of new states and governments, with India, Pakistan, Israel, Vietnam and others declaring independence, rarely without bloodshed. The decade also witnessed the early beginnings of new technologies (including computers, nuclear power and jet propulsion), often first developed in tandem with the war effort, and later adapted and improved upon in the post-war era.

Selena Marie Gomez (born July 22, 1992) is an American actress and singer best known for portraying Alex Russo in the Emmy Award-winning Disney Channel television series Wizards of Waverly Place. She subsequently ventured into feature films and has starred in the television movies Another Cinderella Story, Wizards of Waverly Place: The Movie, and Princess Protection Program. She made her starring theatrical film debut in Ramona and Beezus.

Her career has expanded into the music industry; Gomez is the lead singer and founder of the pop band Selena Gomez & the Scene, which has released three RIAA Gold certified studio albums, Kiss & Tell, A Year Without Rain, and When the Sun Goes Down, spawned three RIAA Platinum certified singles, "Naturally", "Who Says" and "Love You Like a Love Song" and charted four No. 1 Billboard Hot Dance Club Songs. Gomez has also contributed to the soundtracks of Tinker Bell, Another Cinderella Story, Wizards of Waverly Place, and Shake It Up after signing a record deal with Hollywood Records.

Justin Drew Bieber ( /ˈbiːbər/ BEE-bər, born March 1, 1994) is a Canadian Pop/R&B singer-songwriter, musician, and actor. Bieber was discovered in 2008 by Scooter Braun, who came across Bieber's videos on YouTube and later became his manager. Braun arranged for him to meet with Usher in Atlanta, Georgia, and Bieber was soon signed to Raymond Braun Media Group (RBMG), a joint venture between Braun and Usher, and then to a recording contract with Island Records offered by L.A. Reid. Bieber's debut single, "One Time", was released in 2009 and peaked in the top twenty in Canada and charted in the top thirty in several international markets. His debut album, the seven-track EP My World, followed in November 2009, and was soon certified platinum in the United States. He became the first artist to have seven songs from a debut album chart on the Billboard Hot 100.

Onika Tanya Maraj (born December 8, 1982), known by her stage name Nicki Minaj ( /mɪˈnɑːʒ/), is a Trinidadian-born American rapper and singer-songwriter. She was born in Saint James, Trinidad and Tobago and when she was 5 years of age she moved to the New York City borough of Queens, where she grew up.

After releasing three mixtapes between 2007 and 2009 and being signed to Young Money Entertainment in August 2009, Minaj released her debut album, Pink Friday, in November 2010. It quickly became a commercial success, peaking at number one on the U.S. Billboard 200 and being certified Platinum by the Recording Industry Association of America (RIAA) a month after its release. She became the first female solo artist to have seven singles on the Billboard Hot 100 at the same time. Her second single, "Your Love", reached number 1 on the Billboard Hot Rap Songs chart, making Minaj the first female artist to top the chart unaccompanied since 2002. She also became the first female artist to be included on MTV's Annual Hottest MC List. Minaj was named the 2011 Rising Star by Billboard. Her second studio album, Pink Friday: Roman Reloaded was released on April 3, 2012.

Marilyn Maxwell (August 3, 1921 – March 20, 1972), born Marvel Marilyn Maxwell, was an American actress and entertainer.

Noted for her blonde hair and sexually alluring persona, she appeared in several films and radio programs, and entertained the troops during World War II and the Korean War on USO tours with Bob Hope.

She started her professional entertaining career as a radio singer while still a teenager before signing with MGM in 1942 as a contract player. Among the programs in which she appeared was The Abbott and Costello Show. The head of MGM, Louis B. Mayer, insisted she change the "Marvel" part of her real name. She dropped her first name and kept the middle. Some of her film roles included Lost in a Harem (1944), Champion (1949), The Lemon Drop Kid (1951), and Rock-A-Bye Baby (1958). The song "Silver Bells" made its debut in The Lemon Drop Kid, sung by Maxwell and Hope.

Maxwell appeared twice as a singer in the second season (1955–1956) of NBC's The Jimmy Durante Show. On May 16, 1957, she guest starred on NBC's The Ford Show, Starring Tennessee Ernie Ford.