Jennifer Aniston got a makeunder to film her new movie Cake, in which she plays a woman in a chronic pain support group Credit: Mariotto/Fresh/

All in a day's work! Jennifer Aniston got into character for her new movie, Cake, by getting a makeunder and filming scenes in a cemetery in L.A. on Thursday, April 3.

Wearing baggy pants, a loose T-shirt, and an oversized gray cardigan, the Horrible Bosses 2 star, 45, looked considerably less glamorous than her usual self. Her hair -- which seemed a little darker -- was styled in a straight, shoulder-length cut, and she appeared to be wearing minimal makeup.

Cake stars Aniston as an "acerbic woman who becomes fascinated by the suicide of another woman in her chronic pain support group," Variety reported in February. Her character develops a bond with the woman's husband (played by Sam Worthington), as she grapples with a personal tragedy of her own. Anna Kendrick and The Mindy Project's Chris Messina also star.

Offscreen, the Friends alum is looking and feeling better than ever. In an interview with WWD last month, Justin Theroux's fiancee said, "Women and men today in their 40s are so much healthier than they were 30 years ago in their 40s. It was a different time...We know how to take care of ourselves."