Luci Newton had been practicing her princess wave since she learned she would be the star of the Children’s Healthcare of Atlanta Christmas Parade in midtown Atlanta last week. But the 6-year-old was no stranger to the frilly dress she donned Saturday as she smiled and waved to the crowd. Having been through six procedures at Children’s, she is a bit of a celebrity at the Atlanta hospital, where nurses and staff know her as the tutu girl, who wears frilly frocks to every visit and procedure.