The 85-year-old Playboy founder is due to marry 24-year-old Crystal in an outdoor ceremony at the Playboy Mansion on June 18, with 300 family members and friends in attendance - including Hugh's ex-girlfriend Kendra Wilkinson.
In a video posted on Heatworld.com, the blonde beauty said: "It's all really colourful so far - we're having the party in the backyard. We'll have around 300 guests and my dress is going to be Pink."
Hugh added: "Of course it is! It's going to be a garden party."
The media mogul - who was in London at the weekend with Crystal to launch his new Playboy Club in the UK capital - has previously admitted he is prepared to do anything to give his fiancee the wedding of her dreams.
His spokesperson Kellie Olisky said: "No expense is being spared for the wedding. It isn't even a compromise, because Hef wants Crystal to have the wedding of her dreams.
"Hef asked that the flowers be bursting with colour and this will look great with Crystal's lighter coloured theme everywhere else."
Crystal's two sisters and Playmate Anna Berglund will be her bridesmaids, while Hugh's brother Keith and his sons Marston and Cooper will form the groom's party.