The ship was officially named by its Godmother, Reshma Saujani, founder of non-profit Girls Who Code and author of "Brave, Not Perfect". Apex’s US launch was originally planned for late March 2020.
Following a short run of Greek Island sailings in the summer, Apex has now embarked for the first time from US shores on rotating Eastern and Western Caribbean itineraries.
Richard Fain, chairman and chief executive of the Royal Caribbean Group, said the company was "elated" to welcome Celebrity Apex to its portfolio of vessels.
"As we welcome guests back to the seas aboard the newest Edge class ship, we are excited to deliver the very best vacation experience that is the hallmark of every Celebrity cruise," he added.