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1949–1960: Starting a freelance career

Davis filmed The Story of a Divorce (released by RKO Radio Pictures in 1951 as Payment on Demand). She played a Broadway star in All About Eve (1950), which earned her another Oscar nomination and won her the Cannes Film Festival Award for Best Actress. Davis read the script, described it as the best she had ever read, and accepted the role. Within days, she joined the cast in San Francisco to begin filming. During production, she established what became a lifelong friendship with her co-star Anne Baxter and a romantic relationship with her leading man Gary Merrill, which led to marriage. The film's director Joseph L. Mankiewicz later remarked: "Bette was letter perfect. She was syllable-perfect. The director's dream: the prepared actress."

Critics responded positively to Davis's performance, and several of her lines became well-known, particularly "Fasten your seat belts, it's going to be a bumpy night". She was again nominated for an Academy Award, and critics such as Gene Ringgold described her Margo as her "all-time best performance". Pauline Kael wrote that much of Mankiewicz's vision of "the theater" was "nonsense", but commended Davis, writing " saved by one performance that is the real thing: Bette Davis is at her most instinctive and assured. Her actress – vain, scared, a woman who goes too far in her reactions and emotions – makes the whole thing come alive." Davis won a Best Actress award from the Cannes Film Festival, and the New York Film Critics Circle Award. She also received the San Francisco Film Critics Circle Award as Best Actress, having been named by them as the Worst Actress of 1949 for Beyond the Forest. During this time, she was invited to leave her hand prints in the forecourt of Grauman's Chinese Theatre.

On July 3, 1950, Davis's divorce from William Sherry was finalized, and on July 28, she married Gary Merrill, her fourth and final husband. With Sherry's consent, Merrill adopted B.D., Davis's daughter with Sherry. In January 1951, Davis and Merrill adopted a five-day-old baby girl they named Margot Mosher Merrill (born January 6, 1951 - died May 5, 2022), after the character Margo Channing. In 1952, they adopted a baby boy, Michael (born February 5, 1952). Davis and Merrill lived with their three children on an estate on the coast of Cape Elizabeth, Maine. (Davis and Merrill also stayed at Homewood Inn in Yarmouth, Maine, for six months.) After semi-retirement in the mid-1950s, Davis again starred in several movies during her time in Maine, including The Virgin Queen (1955), in which she played Queen Elizabeth I.

The family traveled to England, where Davis and Merrill starred in the murder-mystery film Another Man's Poison (1951). When it received lukewarm reviews and failed at the box office, Hollywood columnists wrote that Davis's comeback had petered out, and an Academy Award nomination for The Star (1952) did not halt her decline at the box office.

In 1952, Davis appeared in the Broadway revue Two's Company, directed by Jules Dassin. She was uncomfortable working outside of her area of expertise; she never had been a musical performer, and her limited theater experience had been more than 20 years earlier. She was also severely ill, and was operated on for osteomyelitis of the jaw. Margot was diagnosed as severely brain-damaged due to an injury sustained during or shortly after her birth, and was placed in an institution around the age of 3. Davis and Merrill began arguing frequently, and B.D. later recalled episodes of alcohol abuse and domestic violence.

Few of Davis's films of the 1950s were successful, and many of her performances were condemned by critics. The Hollywood Reporter wrote of mannerisms "that you'd expect to find in a nightclub impersonation of ", while the London critic Richard Winninger wrote

Miss Davis, with more say than most stars as to what films she makes, seems to have lapsed into egoism. The criterion for her choice of film would appear to be that nothing must compete with the full display of each facet of the Davis art. Only bad films are good enough for her.

Her films of this period included Storm Center (1956) and The Catered Affair (1956). As her career declined, her marriage continued to deteriorate until she filed for divorce in 1960. The following year, her mother died. During the same time, she tried television, appearing in three episodes of the popular NBC Western Wagon Train as three different characters in 1959 and 1961; her first appearance on TV had been February 25, 1956, on General Electric Theatre.

In 1960, Davis, a registered Democrat, appeared at the 1960 Democratic National Convention in Los Angeles, where she met future President John F. Kennedy, whom she greatly admired. Outside of acting and politics, Davis was an active and practicing Episcopalian.