Cyrus picks up some school supplies at an Office Depot in Los Angeles. Plus: Jessica Simpson, Nicole Richie and Jay-Z, Matt Damon and more

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SUPPLY & DEMAND

Now a junior in high school, Miley Cyrus makes a pit stop at an Office Depot in Los Angeles to buy school supplies on Monday with mom Tish (not pictured). What's the 15-year-old Hannah Montana star's favorite subject? "Math because there's always a right or wrong answer!" she told PEOPLE.

See more stars getting ready for school.