When Nicole Kidman arrived in Cannes on Monday night to promote her new movie Grace of Monaco, we were all a bit confused.

Mainly because the 46-year-old actress looks completely different to the last time we saw her.

The blonde Hollywood star's face looked oddly puffy when she arrived on the red carpet at the world-famous film festival.

The Australia actress, who showed off her slender frame in a black bodycon dress, wore her hair scraped back off her face, which highlighted her bizarre complexion.

But Nicole seemed oblivious to the difference in her appearance, and spent the evening smiling for photographers and blowing kisses at her fans.

Last year, the mum-of-two told Italian newspaper La Repubblica she would never have surgery.

"No surgery for me; I did try Botox, unfortunately, but I got out of it and now I can finally move my face again," she said.

The Australia actress led the way as a host of A-list Hollywood stars arrived in the south of France for the start of Cannes Film Festival on Tuesday night.

The opening film - "Grace of Monoco" stars Kidman as the Hollywood actress Grace Kelly who became the Princess of Monaco when she married Prince Rainier, and died following a car crash in 1982 in the hills of the principality.

There are 18 films in competition for the coveted Palme d'Or, which will be handed out along with other prizes at the end of the festival on May 24.

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