PHOTOS: Dancing with the Stars Celebrates 300 Episodes!Contestants and pros old and new come together to toast the show's big birthday

DANCING DARLING

Arriving in Hollywood just after learning she and partner Val Chmerkovskiy would be in next week's finals, contestant Zendaya told PEOPLE, "I literally rehearse in my sleep. Val will always be like, 'Do you need to sleep on it?' And I'll go home and I'll literally come back the next day way better because I can't sleep. I dance in my dreams."