Britannia Rules?

Not really, although being the biggest cruiseliner of P & O Cruises (built in 2015, 3650 passengers 143.000 ton), she is not the biggest in her league.
Here you see her entering the port of Stavanger, Norway. There is one record breaking feature on this vessel however. She's bearing the biggest Union flag in the world on her bow, almost one hundred meter long.
I don't like the modern passenger liners, check out all the hundreds of same balconies. You will be suprised how identical modern livestock vessels and passenger vessels look like today. And basically, it is the same, only the price per cabin is different.