What's in: strawberry blond. "When I think of Summer reds, I think of strawberry and sunset colors," Vo says. But this season's red is more of a rose gold or blushing blond, not Lucille Ball-bright red. "It's a Nicole Kidman-blond," he adds. Other stars seen wearing the trend: Katherine Heigl  (who Vo colors), Jennifer Lawrence, and Scarlett Johansson .
What's in: vanilla vamp. "It's that '50s-gorgeous color that has dimension," Vo says. "It has a warm, vanilla base, but it has cool highlights, like the girl next door with the bike." Stars seen wearing the trend: Britney Spears  (who Vo works with), January Jones , and Emma Stone .
What's out: stripey highlights: "I think very big, thick lowlights and highlights are out," Vo explains. To modernize a bold tone, just go for it, Vo advises. Example: Kelly Osbourne and her no-holds-barred lavender coiffure.