The two are set to tie the knot on June 18, a Playboy rep tells PEOPLE, and they will be married at the Playboy Mansion.
With the wedding planning underway, Harris has begun picking out her dress, hunting for the perfect cake and ... posing for a pre-wedding Playboy spread, set to run in June, just before her nuptials.
"It's kind of just a romantic, roaming-around-the-mansion type thing," Harris told The New Yorker, which followed her as she tried on two Romona Keveza gowns in Los Angeles. Of her options, Harris seemed partial to a strapless pink dress with silk-organza rosettes, preferring it over a full, strapless ivory dress.
Hefner, 84, popped the question over Christmas – and he announced the news on Twitter. First, he simply said that he had bought Crystal a ring before later clarifying it was of the engagement variety.
"He did it on purpose," Harris told The New Yorker. Once the world heard of her engagement, she says, "all of a sudden it was everywhere. I had, like, fans in Sweden, Slovakia, Russia – everywhere."
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