Miley Cyrus [Photo/Agencies]

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Miley Cyrus sticks her tongue out in pictures because she doesn't "know how to smile".

The 'Wrecking Ball' hitmaker can't help but pull her signature pose when she's standing in front of cameras because she feels "awkward" just standing there grinning.

She said: "I get embarrassed to take pictures. That's actually the truth. I'm so embarrassed, because people are taking pictures of me, and I just don't know how to -- I don't know how to smile, and just be awkward, so I stick my tongue out, because I don't know what else to do."

Meanwhile, the 21-year-old singer, who has hit the headlines this year for her provocative music videos and controversial performances, admits she doesn't search herself on the internet any more because the negative comments ruin her happiness.

Speaking on US TV show 'Barbara Walters Presents: The 10 Most Fascinating People of 2013', she explained: "I refuse to Google myself. The minute I stopped Googling myself, you don't imagine what a happier person I am."