"Iron Man 3" star Gwyneth Paltrow has been named People magazine's 2013 Most Beautiful Woman, succeeding last year's top pick, singer Beyoncé.

"Honestly, I can't believe it," Paltrow, 40, says in the issue being published Friday. "I kept thinking, 'This can't be true.' I've never been more surprised or flattered."

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She says that her body feels "more in proportion now than I was when I was 20, so I feel better in a bathing suit now than I did before I had kids. But I think one of the most beautiful things about growing up is this self-acceptance that starts to happen."

The actress, who won an Academy Award for her leading role in 1998's "Shakespeare in Love," told the magazine she credits her five-day-a-week Tracy