The City star was said to have tied the knot at City Hall in New York, having originally planned to wed this autumn in the Caribbean.
However, according to her rep, although Olivia and Johannes have been planing a small civil ceremony ahead of their big day, it has apparently not yet taken place.
Barbara Saint-Aime told the New York Post: "They had always planned to have a small civil wedding in June. They are not married yet.
"They are doing a much smaller civil ceremony in the States this month and they are planning to do something much larger later on."
Fashionista and socialite Olivia has been dating Johannes for the last six-and-a-half years. In January, Johannes popped the question and got engaged to Olivia with a dazzling diamond ring.
Couples who have got engaged in 2014:
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