Jennifer Aniston's new movie The Baster is currently casting less than picture-perfect extras to star alongside the former Friends star in her latest comedy caper.

The advertisement, posted on Craigslist, is asking for a fat woman who is comfortable being sworn at and a skinny acne-ridden teenage boy.

The Baster follows a man (Jason Bateman) whose best friend (Jennifer) becomes pregnant via an unknown sperm doner, or so she is lead to believe.

After years away from New York Jennifer's character returns to the city with her seven-year-old son, unaware that her best friend is keeping a shocking secret - he is the true biological father. 

Jeff Goldblum is also rumoured to be strarring in the film.

See Jennifer in doggy caper Marley & Me below