Cyrus Rose is a lawyer and the second husband of Eleanor Waldorf. He is the father of Aaron Rose and a stepfather of Blair Waldorf.

Cyrus has a son called Aaron Rose, and is the stepfather of Blair Waldorf. She strongly dislikes him at first, however when she realises how happy her mother is with him, she lets them be. Cyrus has helped Blair through times, helping her get into NYU when her Yale plans didn't work out. He also helped her meet Lady Gaga, as he and her are very good friends.