Singing for President Barack Obama on his first night of office left Grammy-winning singer Mariah Carey full of nerves.

Carey was feeling a bit of fear prior to her inauguration performance, Fox news reported.

Everyone was calming her down, telling her she would be great, according to a source.

The Always Be My Baby singer donned a gorgeous black velvet floor-length gown and sang into a diamante-encrusted microphone at the Neighborhood ball, the first of ten balls the Obama's attended.

Carey sang her platinum-selling hit Hero

I wrote this song to inspire people that anything is possible. Tonight I think we all believe that a whole lot more, Mariah said.

This is for everyone out there with a dream, and of course, I have to dedicate it to our new president, she added.

Watch Mariah Carey sing Hero to new President Barack Obama: