How Sacha Baron Cohen pulled off Oscars Ali G appearance

Sacha Baron Cohen managed to pull of an Ali G appearance at the Oscars with the help of wife Isla Fisher. Photo / Supplied

Australian actress Isla Fisher purposely picked out a "wide dress" for the Oscars to help husband Sacha Baron Cohen smuggle in his Ali G costume.

The 44-year-old British comedian caused an uproar when he presented at the 88th Academy Awards last month in character as the fictional troublemaker, alongside Olivia Wilde.

It's claimed Baron Cohen was warned not to pull any stunts at the show by Oscars producers, but Fisher reveals she helped her other half make it happen anyway.

How this dress helped Sacha Baron Cohen to appear as Ali G.

"When you have to fit giant glasses, a beard, a hat, a glove and makeup into Spanx (shapewear leggings), you have to wear a wide dress," she tells Entertainment Tonight of how her glamorous outfit was tailored to smuggle the Ali G costume into the event.

"Let's just say I wasn't comfortable with sitting down."

Fisher and Baron Cohen have had quite an eventful week promoting his new film Grimsby, which hit New Zealand cinemas on March 10.

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The couple found themselves randomly watching the movie earlier this week with Courteney Cox and members of the Kardashian family, including Kim Kardashian, her husband Kanye West, Kourtney Kardashian, matriarch Kris Jenner and Kris' boyfriend Corey Gamble.

"I guess Sacha, my husband, asked our friend Courteney if, because the movie was very English, if she knew any average American families that could see the movie and give us some tips," Fisher says - noting she had never met them before the get-together took place. "Then smash cut, there are the Kardashians!"

- AAP