The 48-year-old actress admits she is a sucker for loving gestures and is always thrilled when her 33-year-old spouse leaves her a note professing his feelings for her at their house or tells her how much she means to him.
In a joint interview with Jennifer Aniston and Alicia Keys for Glamour magazine, she said: "I get giddy when Ashton shows me another way of saying `I love you` - any little thought or gesture that`s playful or sweet. We leave Post-it notes for each other; some have been sticking up for five or six years! For me, it`s the small things."
`You Don`t Know My Name` singer Alicia insists the most important thing for her and her husband Swizz Beatz`s relationship is that they continue to "grow together" as a couple.
The 30-year-old musician - who has a nine-month-old son, Egypt, with the rapper-and-producer - said: "We`re such a bonded happy family, and I hope that we`ll always be able to be that. For me, the most important thing is that we always take the time to understand each other and grow together."
Jennifer - who is dating Justin Theroux - insisted she couldn`t be in a relationship which didn`t have "equality, generosity, integrity, spirit, kindness and humour. And awesomeness."
Demi, Jennifer and Alicia were interviewed by the magazine to talk about the short films they each directed for new project `Five` which deal with women who have battled breast cancer