More than 25 years after her death, Audrey Hepburn is still one of the most beloved of all movie stars. (And one of the few to achieve an EGOT -- Emmy, Grammy, Oscar and Tony.) The graceful style icon and humanitarian would have turned 90 on May 4. Here are her most essential movies.

"Breakfast at Tiffany's" (1961)
Although it wasn't the movie that won her the Oscar, commitment-phobic party girl Holly Golightly remains her most iconic character. Pretty much everyone in "Pretty Little Liars" wanted to go as Holly for their Audrey Hepburn costume party. That wouldn't be the case if anyone else had played her.

" Gregory Peck + Rome = amoré. She won a Best Actress Oscar for her role as a duty-bound European princess who plays hooky while in Rome. She gets a haircut and voila, no one recognizes her, except for a savvy reporter (Peck), who doesn't let on that he knows who she is. The two do everything you should in Rome: Eat gelato, ride a scooter, and visit the Mouth of Truth. And maybe fall in love? As classic as they come.

"Sabrina" (1954)
Hepburn is at her most winning (and wears some of her most gorgeous gowns) in this romance directed by Julia Ormond can't hold a candle to the ever-luminous Audrey.

"Mary Poppins," of all movies. Even with that strike against it, the movie remains a musical favorite.

"2002 remake.)

"Fred Astaire) decide she's the next big thing. Soon she's modeling in Paris (the photo shoot scenes are delicious) and singing "S'Wonderful" with Astaire. That's right, she does her own (quite lovely) singing in this movie, including the solo number "How Long Has This Been Going On?"

"Gary Cooper. Thanks to the case files of her private investigator father, she pretends to have as colorful a love life as he does. It's a rather bittersweet romance, since it's sure to end in heartbreak. Isn't it?

"Shirley MacLaine play teachers whose lives are turned upside down when a young student accuses them of being lovers. Based on the 1934 play by Lillian Hellman, it was still a pretty taboo subject in 1961.

"Richard Crenna, who plays his accomplice, in the photo.)

"Albert Finney are a not-very-happily married couple who spar with each other on a road trip through . It unfolds in a non-linear fashion, which was rather experimental at the time. Also, Hepburn wears the most fabulous '60s mod sunglasses ever.

"The Nun's Story" (1959)
Hepburn often cited this as her favorite film, and it's certainly one of her most dramatic. It was also one of her biggest hits and was nominated for 8 Oscars, including a Best Actress nomination for her. It's based on the true story of a nun who wanted to devote her life to treating tropical illnesses. In the Belgian Congo, she faces more challenges than she expected, including the doubts raised by the atheist doctor (Peter Finch). And when World War II breaks out, she cannot stay neutral as her order demands.