All About Eve (1950)

Be careful who your friends are.
Margo Channing (Bette Davis) is a huge Broadway star and has many fans, including the young Eve Harrington (Anne Baxter), who through her kindness and generosity worms her way into Margo's life, first becoming her assistant and then understudy.
Now, Margo is almost Bette Davis on the screen, lively and fully-fleshed out, but she is aging and is rather depressed about the whole thing, especially since her boyfriend (and director), Bill (Gary Merrill) is eight years younger than her, his birthday party is one of the highlights. However, unlike Bette Davis, Margo accepts her lot in life and understands and feels that Lloyd (Hugh Marlowe), the playwright, should have a younger actress for his new play, which is how Eve really becomes famous.
But Eve isn't who she says and the columnist, who is rather nasty despite his well-meaning intentions, Addison DeWitt (George Sanders, in his Oscar-winning role) discovers that Eve is a liar and manipulator. So that story Eve tells you in the beginning isn't true. And that the fact that she lied about her husband dying in the war is truly an insult to those brave men who did actually died in the war and the women who loved them, truer words have never been said.
Despite the heavy dialogue, there are some brilliant, witty lines and the acting is impeccable, with fully fleshed characters filling every nook and cranny of this film. And while this story has been told time and time again, this film is still worth watching as it is brilliant and Davis delivers probably her best performance. Grade: A
Side Notes:
-Lloyd does not wear a wedding ring but Bill does.
-Merrill would marry Davis in real life.
-Thelma Ritter would earn her first nomination as Birdie, Margo's dresser. Only Birdie is skeptical of Eve from the beginning.
-Celeste Holm also provides excellent support as the third lead, Karen Richards, who gets the plot moving by introducing Eve to Margo but she can be nasty when she wants to be as well, though she feels quite guilty about it later.
-This film churns the debate: is friendship or fame better?
-The ending never ceases to surprise me and I've seen the film three times.