Audrina Patridge and Kristin Cavallari look relaxed as they shoot scenes for The Hills while having lunch in Beverly Hills.

But while the stars appear not to have a care in the world, producers should be quaking in their boots over plans for a juicy tell all book about the show.

Cavallari wants to out the people behind the show for trying to create fake drama for the cast.

Smile, you're on camera: The Hills stars Audrina Patridge and Kristin Cavallari shoot scenes from the final season of the show while having lunch in LA

Hug it out: The co-stars embrace as they met up at a Beverly Hills

Internet rumours claim 'The Hill's executives have been plying the cast with alcohol, paying them to spread gossip about each other and even encouraging them to make sex tapes to leak to the press.

'Some producers are definintely manipulative and dishonest,' cast member Alex Jervy Smith told Intouch magazine.

And despite making a living from the show, Cavallari plans to expose all the dirty secrets once the final episode has aired.

Coming to an end: Patridge and Cavallari enjoy their time together with filming soon to wrap on the final season of the show

'After 'The Hills' I plan to work on many business opportunities,' she said. 'I have always wanted to write a tell all book.'

Cavallari will be following in the footsteps of her ex co-star Lauren Conrad who wrote 'LA Candy' shortly after she quit.

The novel is losely based on her own life and hit the New York best-sellers list shortly after it was released.