Timeless beauty Sigourney Weaver, 66, rocks flared trousers and chic jacket for A Monster Calls screening at BFI London Film Festival 

She always looks impossibly chic and sophisticated.

And Sigourney Weaver embraced understated glamour when she descended upon the A Monster Calls screening at BFI London Film Festival at the Odeon Leicester Square on Thursday evening.

The 66-year-old actress covered up against the autumnal chill in a pair of smart flared trousers and a matching jacket.

Scroll down for video 

Leading the way: Sigourney Weaver embraced understated glamour when she descended upon the A Monster Calls screening at BFI London Film Festival at the Odeon Leicester Square on Thursday evening

Leading the way: Sigourney Weaver embraced understated glamour when she descended upon the A Monster Calls screening at BFI London Film Festival at the Odeon Leicester Square on Thursday evening

Sigourney paired her smart separates with a long-sleeved beige blouse and towering heels, adding to the illusion of endless legs under her floor-skimming trousers.

The Alien star added a touch of sparkle to her attire with a glitzy clutch bag and feather-shaped earrings.

She styled her brunette bob in a voluminous blow dry and kept her make-up simple and elegant.

Elegant: The 66-year-old actress covered up against the autumnal chill in a pair of smart flared trousers and a matching jacket

Elegant: The 66-year-old actress covered up against the autumnal chill in a pair of smart flared trousers and a matching jacket

All-black ensemble: Sigourney paired her smart separates with a long-sleeved beige blouse and towering heels, adding to the illusion of endless legs under her floor-skimming trousers

All-black ensemble: Sigourney paired her smart separates with a long-sleeved beige blouse and towering heels, adding to the illusion of endless legs under her floor-skimming trousers

Glamorous: The Alien star added a touch of sparkle to her attire with a glitzy clutch bag and feather-shaped earrings

Glamorous: The Alien star added a touch of sparkle to her attire with a glitzy clutch bag and feather-shaped earrings

Strike a pose: Sigourney walked the red carpet with her co-star Lewis MacDougall

Strike a pose: Sigourney walked the red carpet with her co-star Lewis MacDougall

In her new film, Weaver plays the grandmother of a young boy (Lewis MacDougall) who imagines a huge tree monster, played by Liam Neeson, to help him deal with his mother's terminal illness.

Of her highly emotional scenes with The Theory Of Everything star Felicity Jones, who plays the mother, Weaver said: 'We knew what we were getting into, we knew the emotional drain.

'It is tough to be in that world a lot and I'm not sure we ever left it , we were all away from home, working in Barcelona and that is what we were there to do, to tell that story.'

Moving story: Weaver plays the grandmother of a young boy (Lewis MacDougall) who imagines a huge tree monster to help him deal with his mother's terminal illness

Moving story: Weaver plays the grandmother of a young boy (Lewis MacDougall) who imagines a huge tree monster to help him deal with his mother's terminal illness

Making an entrance: The A-list actress captured everyone's attention as she made her arrival

Making an entrance: The A-list actress captured everyone's attention as she made her arrival

Royal wave: Sigourney was the picture of sophistication for her big night 

Royal wave: Sigourney was the picture of sophistication for her big night 

In demand: The actress happily answered questions as she made her way down the red carpet

In demand: The actress happily answered questions as she made her way down the red carpet

Fan favourite: The star paused to chat to fans of her work 

Fan favourite: The star paused to chat to fans of her work 

Emotional film: She said, 'We knew what we were getting into, we knew the emotional drain'

Emotional film: She said, 'We knew what we were getting into, we knew the emotional drain'

Of her highly emotional scenes with The Theory Of Everything star Felicity Jones, who plays the mother, Weaver said: "We knew what we were getting into, we knew the emotional drain.

The film is directed by J.A. Bayona, whose next project is the highly anticipated Jurassic World sequel. 

A Monster Calls will be released in UK cinemas on January 6 2017.

Top talent: The film is directed by J.A. Bayona, whose next project is the highly anticipated Jurassic World sequel

Top talent: The film is directed by J.A. Bayona, whose next project is the highly anticipated Jurassic World sequel

Timeless beauty: Sigourney set off her striking features with minimal make-up
Timeless beauty: Sigourney set off her striking features with minimal make-up

Timeless beauty: Sigourney set off her striking features with minimal make-up

Line-up: Belen Atienza and J.A. Bayona posed alongside Lewis and Sigourney 

Line-up: Belen Atienza and J.A. Bayona posed alongside Lewis and Sigourney 

2017 release: A Monster Calls will be released in UK cinemas on January 6 2017

2017 release: A Monster Calls will be released in UK cinemas on January 6 2017

The comments below have not been moderated.

The views expressed in the contents above are those of our users and do not necessarily reflect the views of MailOnline.

By posting your comment you agree to our house rules.

Who is this week's top commenter? Find out now