Leighann Marlow is a girl that mentioned in The Third Wheel. She sits in the same chair for homeroom that Greg sits in History class. So he wrote to her on his table to request to come to Valentine's Day Dance with him which did not cost a cent from buying Candy Grams. But unfortunately, he forgot that the detention is held in this same room as History, some Morons jumped in for the answer before Leighann had an chance to read Greg's note. She rejected it to join for Valentine's Day Dance with him.