Hollywood was in a state of mourning after Catherine died on January 30 at the age of 71 from a pulmonary embolism with rectal cancer being the underlying cause.
The 67-year-old previously carried on a busy acting career alongside her life as a pop diva, winning a Golden Globe for starring in the 1995 movie musical Evita.
After debuting to critical acclaim last year, the cast of The Studio were back hard at work for season two of the hit Apple+ show on Monday at the The Gritti Palace in Venice.
It's a condition that kills nearly 3,000 Britons every year. But according to Professor Rasha Al-Lamee, a cardiologist at Imperial College London , many patients are unaware of the early signs.
Her face was almost gaunt, but she still looked very pretty, she had a touch of glam going. She hid her figure in a bulky green pinstriped suit, said a fellow guest.
In death as in life, the beloved actress Catherine O'Hara keenly protected her privacy. Her death, sources say, has left some friends it 'complete shock'.
Macaulay Culkin was spotted out in the Los Angeles area on Friday, shortly after news broke of his former Home Alone costar Catherine O'Hara's death at age 71.