trey moses , a kentucky high school student who has committed to ball state next year , surprised ellie meredith during her p.e. class on thursday .
he asked her to prom with flowers and a sign reading : ` let 's party like it 's 1989 ' - a reference to an album by taylor swift , ellie 's favorite singer .
she accepted and is now looking forward to going dress shopping .
moses works with teenagers with developmental disabilities through a volunteer program in louisville .