“Love Finds Andy Hardy” is a 1938 American romantic comedy film that tells the story of a teenage boy who becomes entangled with three different girls all at the same time.
It stars Mickey Rooney, Lewis Stone, Fay Holden, Cecilia Parker, Judy Garland, Lana Turner, Ann Rutherford, Mary Howard and Gene Reynolds.

Love Finds Andy Hardy was selected for preservation in the United States National Film Registry by the Library of Congress as being “culturally, historically, or aesthetically significant”.

This was the first film in which Metro-Goldwyn-Mayer recorded at least part of the soundtrack in stereophonic sound, a practice which was used for a number of MGM musical comedies beginning the late 1930s. The film was presented in standard monaural sound.
Andrew “Andy” Hardy is a fictional character played by Mickey Rooney in a Metro-Goldwyn-Mayer film series from 1937 to 1946, with a film released in 1958 in an unsuccessful attempt to revive the series. Hardy and others were based on characters in the play Skidding by Aurania Rouverol. Early films in the series were about the Hardy family as a whole, but later entries focused on the character of Andy Hardy. Rooney was the only member of the ensemble to appear in all 16 movies. The Hardy films, which were enormously popular in their heyday, were sentimental comedies celebrating ordinary American life.

A Family Affair (1937)
You’re Only Young Once (1937)
Judge Hardy’s Children (1938)
Love Finds Andy Hardy (1938)
Out West with the Hardys (1938)
The Hardys Ride High (1939)
Andy Hardy Gets Spring Fever (1939)
Judge Hardy and Son (1939)[3]
Andy Hardy Meets Debutante (1940)
Andy Hardy’s Private Secretary (1941)
Life Begins for Andy Hardy (1941)
The Courtship of Andy Hardy (1942)
Andy Hardy’s Double Life (1942)
Andy Hardy’s Blonde Trouble (1944)
Love Laughs at Andy Hardy (1946)
Andy Hardy Comes Home (1958)

Lana Turner plays Cynthia Potter.

Trailer:

You can watch the film here.

Lana Turner did a lot of movies. She really loved being a moviestar.
Here are the most important films in which she starred. Just click the links for more info, photos and videos.

20 April 1937: A Star Is Born
9 Oct. 1937: They Won’t Forget
24 Oct. 1937: The Great Garrick
1 Jan. 1938: The Adventures of Marco Polo
22 July 1938: Love Finds Andy Hardy
12 Aug. 1938: Rich Man, Poor Girl
9 Dec. 1938: Dramatic School
28 April 1939: Calling Dr. Kildare
18 Aug. 1939: These Glamour Girls
29 Sept. 1939: Dancing Co-Ed
19 April 1940: Two Girls on Broadway
19 July 1940: We Who Are Young
25 April 1941: Ziegfeld Girl
12 Aug. 1941: Dr. Jekyll and Mr. Hyde
2 Oct. 1941: Honky Tonk
18 Febr. 1942: Johnny Eager
27 Aug. 1942: Somewhere I’ll Find You
1 April 1943: Slightly Dangerous
19 Aug. 1943: Du Barry Was A Lady
13 Nov. 1943: The Youngest Profession
23 Aug. 1944: Marriage Is a Private Affair
8 March 1945: Keep Your Powder Dry
1 Oct. 1945: Week-End At The Waldorf
2 May 1946: The Postman Always Rings Twice
5 Nov. 1947 : Green Dolphin Street
1 Nov. 1947: Cass Timberlane
29 April 1948: Homecoming
20 Oct. 1948: The Three Musketeers
1 Sept. 1950: A Life Of Her Own
2 March 1951: Mr. Imperium
5 Sept. 1952: The Merry Widow
25 Dec. 1952: The Bad And The Beautiful
25 Aug. 1953: Latin Lovers
1 May 1954: Flame And The Flesh
7 Sept. 1954: Betrayed
13 May 1955: The Prodigal
4 June 1955: Sea Chase
14 Dec. 1955: The Rains Of Ranchipur
12 Jan. 1956: Diane
13 Dec. 1957: Peyton Place
30 Jan. 1958: The Lady Takes A Flyer
2 May 1958: Another Time, Another Place
30 April 1959: Imitation Of Life
23 June 1960: Portrait In Black
19 July 1961: By Love Possessed
2 Nov. 1961: Bachelor In Paradise
25 Dec. 1962: Who’s Got The Action?
24 Febr. 1965: Love Has Many Faces
27 April 1966: Madame X
30 April 1969: The Big Cube
7 Nov. 1974: Persecution
27 Oct. 1976: Bittersweet Love
31 Oct. 1980: Witches Brew
21 May 1982: Dead Men Don’t Wear Plaid

Sources: Wikipedia, IMDB, Rotten Tomatoes, Lana’s biography “Lana, the Lady, The Legend, The Truth“, “The Films Of Lana Turner” by Lou Valentino and “Lana Turner, The Memories, The Myths and The Movies” by Cheryl Crane.