10 Most Fascinating Events

From Britney's engagement to Lance Armstrong's record Tour de France win, take a peek at the people who made summer sizzle. By Serena Kappes

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MOST TRAUMATIC TRANSITIONS

Just days after her June 7 graduation from Campbell Hall high school, Mary-Kate Olsen was admitted to a Salt Lake City eating disorder clinic, where she spent her 18th birthday on June 13 (left). On July 24, she emerged looking far healthier, and went on to make her first public appearance at the MTV Video Music Awards on Aug. 29 (right). Days later the teen star broke up with her boyfriend of nine months, David Katzenberg, then moved East to begin her freshman year at New York University with twin Ashley.