Kristina Erickson is a girl, a grade above Greg who is known for throwing huge parties. Only famous and popular kids in the school are allowed and invited to go to her party. Rowley was invited once, but he had to go somewhere the day the party was going to be held, so Greg took his invitation again. But on the day it was her party, it was also Greg's Uncle Gary's wedding, so Greg also missed the party. She was replaced by Jordan Jury in the books.