The 19-year-old singer-and-actress got engaged to boyfriend Liam Hemsworth on May 31 and is already planning her nuptials, though they are unlikely to be this year.
A source told HollywoodLife.com: "Nothing has been definite yet. She`s just pretty much brainstorming everything about her wedding. I know she wants to have a summerwedding, something on the water maybe."
The insider - who explained the ceremony will likely take place in 2013 - says Miley is getting help with planning her big day from her mother Tish Cyrus.
The source added: "It`s totally going to be something not ordinary. That`s Miley for you. It will be something completely different than normal but appropriate for she and Liam.
"Her parents are excited and really, really supportive of them. I know Tish wants to be part of the planning and it wouldn`t surprise me if she`s already begun planning certain things. But Miley hasn`t nailed anything down in stone yet."
The first thing the former `Hannah Montana` star wants to do is decide on her colour scheme.
The source said: "I know that the first thing she and Liam will decide on is their wedding colours. That, they`ve already been talking about but I haven`t asked her what if any colour or theme they`re planning."