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

LIP SERVICE

Anna Trebunskaya, a regular pro on the show who wasn't given a partner this season, told PEOPLE, "It's always interesting because you spend a season with these people, and you don't see each other [afterward]. And then when you see each other … just a few minutes and it's back on. It's like a high school reunion." The dancer said she was especially excited to run into her season 14 partner, Jack Wagner, on Tuesday.