Simplify the following text for a Grade 7 native English-speaking person.
Original: Marija Å erifoviÄ ( born November 14,1984 ) is a singer who won the Eurovision Song Contest in 2007 with the ballad Molitva , which was sung in Serbian .
Simplified: On 28 June 2007 she released an album called : Marija Å erifoviÄ : Molitva - The Best Of .