Iron Man 3: Gwyneth Paltrow claims 'Most Beautiful' title 'obviously not true' at premiere

Gwyneth Paltrow says she's thrilled to be picked by People magazine as World's Most Beautiful Woman for 2013 but it's "obviously not true."

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Paltrow questioned her own selection as she walked the red carpet at the Hollywood premiere of Iron Man 3 last night.

"It's funny, these things, because it's like obviously not true. But it's very sweet to be named that," Paltrow said.

"Because I mean you can't say that, you know! But it's been wonderful. It's been very wonderful. And as my friend said, it's so nice that someone who has kids and is a mum and is not like 21 is named that. It's really an honour."

Paltrow said her two children weren't aware of the news in this week's edition of the magazine, but she'd been getting plenty of congratulatory emails from friends and family.

The 40-year-old actress stars as Pepper Potts, Tony Stark's love interest and assistant-turned-business partner in the Iron Man trilogy. Her co-stars in Iron Man 3 praised People's proclamation.

"Completely justified. Completely justified. She's gorgeous," said Guy Pearce.

"Let me tell you: She is as gracious and beautiful inside as she is outside. She's got a good heart. She's got a good heart. A lovely girl," said Ben Kingsley.

AP