Simplify the following text for a Grade 9 native English-speaking person.
Original: Amanda Joy `` AJ '' Michalka ( born April 10 , 1991 ) , often credited as AJ , is an American actress , singer-songwriter , and musician .
Simplified: Amanda Joy `` AJ '' Michalka ( born April 10 , 1991 ) is an American singer and actress from Torrance , California , USA .