It is a truth universally acknowledged that an actress in search of a gong will invariably have to remove her makeup, un-lithe her limbs and generally make herself as red carpet-unfriendly as possible in pursuit of big screen credibility.
Watch her in action above in our exclusive, special clip.
Jennifer plays Claire, a woman embittered by a car accident, which kills her child and leaves her suffering chronic pain.
When she joins a support group, she becomes obsessed with the tragic fate of another woman going through the same thing. For her career-changing performance, Jennifer earned Best Lead Actress at the Screen Actors Guild and Golden Globe Awards.
'Cake' is in UK cinemas from Friday 20 February. Watch the trailer below...