The 'Neon Lights' hitmaker has been in a relationship with Wilmer since 2010 and recently hinted if he popped the question she'd say yes.
Demi would love to be serenaded by Ed - whose romantic songs have inspired numerous engagements at his concerts - on her special day.
When asked by Scott Mills on the BBC Radio 1 Breakfast Show who she would have as her wedding band, she answered: ''Well I already told Christina Perri that she's playing at my wedding so probably her and I really want Ed Sheeran and the list could go on and on.''
It was also suggested to Demi that rather than wait for Wilmer to propose she could get on one knee and ask him to be her husband, but the pop star wants a traditional offer of marriage from her man.
She said: ''It is fine (for women to propose), I'm just a little old-fashioned when it comes to that. You know I let him call the shots, I make a lot of decisions in my life so it's nice to kind of hand over the control to someone else.''
While her own wedding is on hold, Demi will be a bridesmaid at her friend Iggy Azalea's nuptials and she can't wait to accompany her pal down the aisle before she gets hitched to Los Angeles Lakers basketball player Nick Young.
The 22-year-old singer said: ''I'm really excited about that.''
When quizzed on whether she'd had her dress fitting yet, she said: ''No I haven't, I think she's taking her time with it.''
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