Star comes to earth :
When Star accidentally destroys her kingdom while testing her new wand, her parents sent her to Earth to be safer and live with her new friend Marco.
Party with a Pony:
Star's best friend Pony Head from Mewni comes to Earth to hangout with her before she is taken to St. Olga's Reform School for Wayward Princesses.
From:http://en.wikipedia.org/wiki/Star_vs._the_Forces_of_Evil
