If you visit the P & O website, select weddings and special occasions or follow below link
http://www.pocruises.com/Experience/Wedding.axd You can down load the pdf Gift Collection, including sending to a loved one and the UK number to contact. How wonderful and they say romance is dead, bravo. My birthday is on Valentine’s Day, my husband never buys me flowers, and always advocates to anyone considering flowers for my birthday, you won’t get value for money on Valentine’s Day, so don’t waste your money! Charming.
I.m guessing your best bet is to do it thro P & O, who probably have an on-board florist. Chris.
Singapore Docks are on Harbour Front which is south of the island, in the straits opposite Sentosa Island.
The cruise terminal is Keppel Docks, although it's been reported on this site that P&O sometimes use the container port close by.
Just a bit of info on 14th the Aurora is joined in the port by two other cruise ships namely the Seabourn Spirit and the Silver Whisper, another bit of my useless information !!