Sun: Virgo
In “To Have and Have Not” (Lauren’s first film), we saw a young Bacall casting an sultry coolness, not seen on the silver screen since Garbo (another Virgo sun).  With her earthy nature, Lauren charmed Bogey’s detective mind, enticing him with  her analytical advice and service— “If you want anything, just whistle”.
  
In this film and all that followed, Bacall seems to always be impeccably dressed, proper and practical, with not a hair out of place— even though (like all mutable signs) the mane curls off in different angles on the sides.  Similarly, there's a distinct skewed facial division.  One side of the face shifts upward.  This sets one eye noticeably higher than the other, and it tilts the nose and mouth.  Its difficult to define the physical shape of mutable signs since they change so much, but with Virgo, the twists and bends are held in place by Earth and this makes Virgo the easiest one to detect.

With the passage of time, Lauren’s image has turned into that of a stringent, resourceful and independent woman of the world.  This reflects her sun and the other elements in her chart.
Ascendant: Leo 
When Bacall steps back from her projecting sun energies, the nervous worrisome energies dissipate and she suddenly appears warmer and more self confident. She's holding up her Leo mask and it gives here an elegant and commanding presence. These fixed fire energies also attract attention, but Lauren doesn't mind; She feels at home putting herself out there “on show”. Before film, she began her drama career on stage.

When the film career waned, she made her triumphant return to Broadway performing in “Applause”. With angelic charm, she wins the hearts of her audience. (She has Venus on the ascendant and this relaxes the pompous qualities that often arise from Leo's presence). Physically, we see the lion features in her bone structure— in the block like forehead and in the wide cheek bones.
Moon: Aries 
With the ascendant, the fires are contained.  But as we have seen in Lauren’s rare interviews, the flames often become intense and highly directed, particularly when Lauren reacts or responds to others.  Her moon is in Aries and she will also express exactly what she feels.  There's no beating around the bush.  Everything is to the point.  Positively, this keep Lauren's mutable energies on track and it enhances her sense of independence. 

If you know an Aries moon, you might notice the words “I” “me” and “mine” frequently appear in their emotional outbursts.  Fortunately, these “selfish” moments end as quickly as they start.