How about 20?
1957:
"A Farewell to Arms" - Rock Hudson and Jennifer Jones - 20th Century Fox
"An Affair to Remember" - Cary Grant and Deborah Kerr - 20th Century Fox
"Fire Down Below" - Rita Hayworth, Robert Mitchum, and Jack Lemmon - Columbia
"Funny Face" - Audrey Hepburn and Fred Astaire - Paramount
"Gunfight at the O.K. Corral" - Burt Lancaster and Kirk Douglas - Paramount
"Island in the Sun" - James Mason, Harry Belafonte, Joan Fontaine, Joan Collins, and Dorothy Dandridge - 20th Century Fox
"Jailhouse Rock" - Elvis Presley - MGM
"Jeanne Eagles" - Kim Novak and Jeff Chandler - Columbia
"Jet Pilot" - John Wayne and Janet Leigh - Universal
"Loving You" - Elvis Presley and Dolores Hart - Paramount
"Old Yeller" - Tommy Kirk, Dorothy McGuire and Beverly Washburn - Walt Disney Productions
"Pal Joey" - Rita Hayworth, Frank Sinatra and Kim Novak - Columbia
"Peyton Place" - Lana Turner - 20th Century Fox
"Raintree County" - Montgomery Clift and Elizabeth Taylor - MGM
"Sayonara" - Marlon Brando and Red Buttons - Warner Brothers
"The Bridge on the River Kwai" - William Holden and Alec Guinness - Columbia
"The Prince and the Showgirl" - Marilyn Monroe and Laurence Olivier - Warner Brothers
"The Way to the Gold" - Jeffrey Hunter and Sheree North - 20th Century Fox
"Will Success Spoil Rock Hunter?" - Jayne Mansfield, Tony Randall, Joan Blondell, and Mickey Hargitay - 20th Century Fox
"Witness for the Prosecution" - Tyrone Power and Marlene Dietrich - United Artists