A 34-year-old look-a-like of the Duchess of Cambridge is nervous after receiving death threats.

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On Sunday, Mirror reported that former waitress, Heidi Agan, who now travels the world to show off how much she looks like the princess, is now the target of death threats.

The mom-of-two would not say which country the threats were coming from, but did say: "You have to take the rough with the smooth, and my smooth heavily outweights the rough."

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Apparently, the "smooth" Again is referring to is first-class travel to promote products for brands who want to make customers believe Middleton uses them.

The "rough" is being called out by onlookers who are aware that she is not actually the Duchess of Cambridge.

Agan was discovered while working in a branch of Frankie and Benny's.

"They ask 'Are you really Kate?' I just say 'What do you think?'" she said.

Those that are among most of her fans are male admirers, the site reported.

Since emphasizing on her looks three years ago, she has received 15 proposals.

"If you want to be the best at anything, you have to research," said Heidi who has around three lookalike appointments a week. "Things like hair colour. Has she changed the shade of her lipstick? It's the mannerisms, little things no-one else would be interested in. I noticed, for instance, that when Kate's nervous, she licks her lips," Agan said.

And for the other lookalike rivals, Agan reveals that there is no competition to see who can look the most like her.

"It's not competitive, we understand there is enough work for all of us," she said. "The lookalike family is just that - a family."

As for if she will be cashing in on the birth of Middleton's second child, she said: "This child does not seem to be as popular. The excitement surrounding George was the fact that a future king was coming. Of course, that will all change if Kate has a girl."