In response to the death of the former Oscar nominee and late Mrs. Humphrey Bogart, numerous celebrities went online and expressed their sympathy via Twitter.
Here's a look at what many had to say about Bacall...
Alyssa Milano: Rest with the angels, Lauren Bacall...
Eliza Dushku: Another legend. Goodnight, beauty.
Marlee Matlin: When I told my pal #LaurenBacall I had boyfriend troubles she said "Men, f**k 'em!" Give 'em hell in heaven Betty RIP.
Kris Jenner: "Imagination is the highest kite one can fly." Another legend lost today. Rest in Peace Lauren Bacall.
Debi Mazar: "If you want me, just whistle. You know how to whistle don't you? Just put your lips together and blow"…
Gene Simmons: Lauren Bacall -- sad. R.I.P. She was a class act. She will be missed.
Jenny McCarthy: I had the amazing opportunity to work with Lauren Bacall in the movie Diamonds. She was one of a kind. #legend #RIP.
Alec Baldwin: The great Betty Bacall is gone. Read her first autobiography, BY MYSELF. I love that book.
Lara Spencer: RIP Lauren Bacall...a great lady, timeless actress, and consummate whistler. "You know how to whistle don't you Steve?" To Have And Have Not.
Paula Abdul: An amazing life well lived with great accomplishment. 1 of th last icons of the Hollywood Golden Age #RIPLaurenBacall.