Reese Witherspoon's daughter Ava Phillippe is becoming a star in her own right, and her latest collaboration is her most exciting yet!The 21-year-old is no stranger to changing up her appearance and has unveiled a gorgeous lilac hair transformation this week, as part of her new collaboration with hair dye brand Hally.READ: Reese Witherspoon and Nicole Kidman pose on the beach in nostalgic snapshotTogether with Hally, Ava has helped to create a new limited edition shade from the brand's new line