Swinton upset by Oscar party joke

Tilda Swinton was left upset by a joke about her weight at the Warner Bros Oscars party.

The actress left the celebrations early after organisers referenced the weight she put on her for Oscar-winning role in Michael Clayton by placing control pants in guests' goodie bags.

Anti-wrinkle cream was also included, poking fun at the amount of time George Clooney spent frowning in the film.

A source told The Mirror: "Tilda ate a pie before every scene in Michael Clayton - she said it made her feel uncomfortable in her skin and that helped her get into character as the film's killer.

"Tilda has lost all the weight now and the pants were meant as a joke, not to offend. And, anyway, there were anti-wrinkle pads in the bags, too, in reference to all the frowning George did in the film."

Swinton was reportedly the first celebrity to leave the bash at the Hotel Bel Air.

> Click here for a full list of Oscars 2008 winners