Wittstock made the announcement during an interview with Talk Radio702 and said that Armani is the designer that knows her the best.
She also admitted that in the beginning, it was very difficult for her to adapt to Monaco’s culture, food and people, especially since she is a vegetarian.
On asking her what she busies herself with in Monaco, she said that she has always been involved with charity work, long before she met "the prince", as she calls him.
According to Wittstock, she will still do humanitarian work after her wedding.
A normal day for Wittstock consists of getting a cup of coffee first thing, checking e-mails, studying a thick file which deals with protocol and preparing herself for the upcoming ceremony.
She says she’s presently learning a lot about protocol, they regularly travel to other countries and she also learns what the prince keeps himself busy with.
In the evenings, Wittstock keeps herself busy by spending time at charity organisations.
Wittstock didn’t want to confirm whether she and Prince Albert will be attending the royal wedding of Prince William and Kate Middleton, but she did, however, say that they would send a representative to attend on their behalf if they were not able to make it to the ceremony.
She is flying back to Monaco on Tuesday after visiting South Africa to swim the Midmar Mile in KwaZulu-Natal in support of Special Olympics South Africa. She and Prince Albert will be returning to South Africa in July.