<Tr> <Th> Occupation </Th> <Td> Actress, singer </Td> </Tr> <Tr> <Th> Years active </Th> <Td> 1995--present </Td> </Tr> <Tr> <Td_colspan="2"> Musical career </Td> </Tr> <Tr> <Th> Genres </Th> <Td> Jazz </Td> </Tr>

Who sings the theme song for secret life of an american teenager