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

STYLIN' AND SMILIN'

Catherine Giudici – who cheered on fiancé Sean Lowe until he was eliminated May 7 – told PEOPLE at Tuesday's bash that she'll miss "seeing [Sean] dance and seeing what he brought to the table. It was a nice surprise every Monday." Sean added that he'll "really miss the camaraderie" of the cast.