The couple, who got engaged last month, can't decide whether to elope for their nuptials or stay in Los Angeles, but one thing they have agreed on is the venue size.
Donnie said: ''I'd like a small wedding. A perfect wedding for me would be Jenny, myself, and our three boys.''
Jenny added: ''It would be this year or next year. We like the idea of getting away on a vacation, but we also like the idea of keeping it local.''
However, the 41-year-old presenter admits she's already got lots of plans for her big day lined up if they don't hold their wedding in a different country.
She told Us Magazine: ''Andy [Cohen] would officiate if we're not eloping! [I'd also] like to write my own vows.''
Meanwhile, Donnie, 44, has proved he gets on well with Jenny's 11-year-old son Evan, whom she has with her ex-husband John Mallory Asher, as he asked the youngster for his seal of approval before he proposed to his mum.
A source said previously: ''Donnie asked Evan if it would OK to ask his mum to marry him.''
After Evan said yes, Donnie enlisted him to deliver handwritten notes with the words ''will'', ''you'' and ''marry'' written on them, to Jenny before he appeared wearing a T-shirt printed with the final part of the message, ''me?''
Meanwhile, Donnie has sons Xavier, 21, and Elijah, 12, with his ex-wife Kim Fey.
'Wilson', starring both Dern and Harrelson, is released in U.S. cinemas on March 24th.
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