If you include autobiographies, then oodles of Hollywood stars have done this besides those mentioned. How about Dean Martin, Frank Sinatra, Pat Boone, Dinah Shore, and Debbie Reynolds?
Rockers include Tina Turner, Paul McCartney, and Sting.
It gets a lot harder, though, to find those who wrote “real” books that weren’t just trading on their names.
Not that he completely fills the bill, but I wanted to mention someone who no one else will…
Art Garfunkel
I admit I had to look up #1
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Off to Cafe Society with you all!
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I agree - autobiographies (often ghost written) are without the remit of the OP IMO.
Madonna has written a children’s book as well - it’s not sold like Harry Potter, but was the second best-selling children’s book in the UK when it was launched.
Leonard Nimoy’s I am not Spock, The Ballad of Bilbo Baggins and Invasion of the Body Snatchers.
What about William Shatner?
He’s written a few best sellers and obviously starred in many successful films.
Surely his take on Rocketman went to #1 on the charts!
How about Rupert Holmes? Yes, he’s best known as the singer of “The Pina-Colada Song”, but the man is brilliant. He also wrote the aforementioned song, as well as the music, lyrics, and book for the musical The Mystery of Edwin Drood (for which he holds the distinction of being the only person in history to win a Tony Award for writing all three).
He has also written straight plays (i.e. plays without music) such as Accomplice and Say Goodnight, Gracie, co-produced the television show “Remember WENN”, and wrote the mystery novel “Where the Truth Lies”, which is now a movie.
Okay I feel like I’m writing his bio right now, but that’s some pretty impressive stuff.
If you change #1 to “Written a smash musical,” Elton John fits the bill, having played the Pinball Wizard in Tommy.
Elton really should write his auto-bio.
Prince hasn’t written a book AFAIK, but had both the #1 albums and a top movie.
Shel Silverstein had at least 1 top song - A Boy Named Sue - but also wrote “Cover of the Rolling Stone” by Dr. Hook which did pretty well. Obviously lots of best-selling books…
The music requirement is the real sticking point.
If you want an impressive Trifecta, Tim Allen has had the #1 show, #1 Movie and #1 book.
Chuck Barris wrote the pop tune Palisades Park, a hit for Freddy ‘Boom Boom’ Cannon in 1962, and wrote the theme songs to many of his game shows. His book “Confessions of a Dangerous Mind” was on the NY Times Bestseller list as well as a book he wrote called “You and Me Babe”, and the movie “Confessions of a Dangerous Mind” got up to #8 in the box office.
OK, so none of his stuff actually made it to #1, but you got to give the guy respect for trying.
David Bowie had some huge Albums, #1 singles, Big movie roles, and a few books.
Moonage Daydream : The Life & Times of Ziggy Stardust (Hardcover)
Jim
Michael Crawford, ta! da! He was on the soundtracks to “A Funny Thing Happened on the Way to the Forum,” “Hello Dolly!” and cast recording of “Phantom of the Opera,” was in “Funny Thing,” “Hello Dolly,” “How I Won the War,” “Condoman,” and a bunch of other movies, was a smash hit in the BBC-TV series “Some Mothers Have Em,” and his auto-bio “Parcel Arrived: Tied With String” was a best seller, probably due to the fact that almost every chapter has a reference to his genitals.
[QUOTE=DooWahDiddy]
He also wrote the aforementioned song, as well as the music, lyrics, and book for the musical The Mystery of Edwin Drood (for which he holds the distinction of being the only person in history to win a Tony Award for writing all three)./QUOTE]I saw this yesterday! It was performed by the FSU School of Theater. They did it in their “small” theater with tons of audience participation. A thoroughly enjoyable experience…
how about the French author, singer, musician, writer Boris Vian ? He’s a little bit before best-sellers and block busters movie, but he wrote well-received books and movies, acted in some and had at least one song album.
Bette Midler
The Saga of Baby Divine was a (briefly) bestselling children’s book (now out of print and forgotten)
The Rose was a Number 1 album/single
Several (The Rose, Ruthless People, Beaches, others)
Frank Sinatra
The Sinatra Family Treasures (basically a scrap book)
Many
Several
Patty Duke may qualify.
I’m not sure how big a hit her albums were, though, just that they were successful enough to generate sequels.
I know that Shirley Maclaine has had bestselling books and smash movies and that she has released albums, but I can’t find any evidence any of her albums were bestsellers.
I don’t care how Amazon lists its stock, but Frank Sinatra cannot possibily be considered the author of a book of photos whose limited text is by another person and was published many years after his death.
I know we’re all stretching a bit on this, but the rubber band just snpped.
BTW, Steve Martin’s King Tut was a number one hit single.
Dolly Parton’s autobio was a bestseller when it first came out and she’s had several number one hits and played a sassy smart country gal in several movies.
William Shatner had a number 1 hit with Lucy in the Sky With Diamonds (admittedly it was for about 42 seconds and was a total flash in the pan novelty), bestselling books published under his name and several hit films (Police Squad being the only non Trek one that comes immediately to mind).
Such a pity Carrie Fisher’s Life Day Song never got the vast attention it deserved or she’d have made it! 
Rex Harrison wrote two bestselling autobiographies (Rex and A Damned Serious Business) starred in several blockbuster movies and the soundtrack to the Broadway production of My Fair Lady was one of the bestselling albums of all time to that point. His co-star Julie Andrews has written several books but I don’t know if they were bestsellers; she certainly has movie and recording hits aplenty.
Did Richard Harris ever write anything? Or did his chum O’Toole ever sing anything?
Airplane II, Miss Congeniality, Showtime (2002)
Was going to come here to say Dolly. She also picked out some… interesting roles for her movies as well (for example, an owner of a whorehouse).