LOS ANGELES— Julie Andrews has been Hollywood royalty for decades. Lately, she’s had the parts to prove it with queenly roles in “The Princess Diaries” and “Shrek” films.

Andrews — who again adds her voice to “Shrek the Third” as Queen Lillian, mother-in-law to Mike Myers’ ogre and mom to Cameron Diaz’s ogre princess — is a pragmatic monarch.

Since throat surgery ruined the glorious singing voice of the star of “Mary Poppins,” “The Sound of Music,” “Victor/Victoria” and other films, Andrews finds other ways to express herself, continuing to moonlight as a children’s author and director.

Though she managed a subdued little musical number in 2004’s “The Princess Diaries 2: Royal Engagement,” Andrews said she has not recovered her singing voice in the 10 years since the surgery.

“No, sadly,” Andrews said in an interview to promote “Shrek the Third.” “I’m not singing. My daughter, the one that I write with, said something so lovely. I was bemoaning the fact that I wasn’t singing and how much I missed it. And she said, ‘Mom, you’ve just found a different way of using your voice by writing.’ It made me feel so much better. ...

Andrews, 71, has referred to her talent as “my freak four-octave voice,” which gave her an early start in show business in England. The daughter of music-hall performers, Andrews was singing on stage as a child and was still in her teens when she debuted on Broadway.

She quickly became a Broadway superstar as Eliza Doolittle in “My Fair Lady” and followed that musical as Guinevere in “Camelot.” Andrews’ voice problems developed while she was performing in the Broadway production of “Victor/Victoria” in the mid-1990s. She underwent surgery to remove non-cancerous nodules, but the operation left her without her singing voice. She sued two doctors and Mount Sinai hospital in New York and settled out of court in 2000, with no terms disclosed.

By then, Andrews had long since established herself as a children’s author, a sidelight that became increasingly important with her singing career over. Her books include “Mandy,” “Little Bo,” “The Last of the Really Great Whangdoodles” and her “Dumpy the Dump Truck” tales.

Andrews and daughter Emma Walton Hamilton write together and oversee a collection of children’s stories under Andrews’ name that includes their own works, tales by others and books that had gone out-of-print.

The writing career began about 30 years ago during a simple game with her children “that required the paying of a forfeit,” Andrews said. “I was the first to lose, and I said, ‘What shall my forfeit be?’

“My eldest daughter said, ‘Write me a story,’ and I thought, OK, because I used to make up little tales for them. I thought a couple of pages of an Aesop’s fable would be fine, but she was my new stepdaughter, and I thought, well, maybe I can really make something of this and give her a gift.”

Andrews was brought in for 2004’s “Shrek 2” as the voice of Lillian, wife of the frog king Harold.

Though her singing career is behind her, Andrews does get to hum a tune in “Shrek the Third.” In a dizzy moment for Queen Lillian, she trills through a few bars of “My Favorite Things,” one of the songs from “The Sound of Music.”

“It felt like a charmingly wicked thing to do,” Andrews said.