Rumer – Moore’s eldest daughter with ex-husband Bruce Willis, 58 – reportedly took her mother to see Friday’s band Dead Sara in Los Angeles eight months ago.
She was with Sean from the beginning of the trip acting very affectionate and making it very obvious they are a couple.
"Demi was very comfortable and happy spending every moment she could with Sean.
The first day she went and got them towels and they laid down together on a beach bed and cuddled all day long.
When they were sitting up, they put their arms around each other or she sat in his lap and whispered in his ear.
She was sipping a can of Red Bull and smiling at Sean as she sat with her arms around him and couldn't stop laughing." "She seemed so in love and happy. "Demi has been to Tulum many times before, but she looked happier than ever on this trip,” the source added.
“She loved being with her guy and having someone to share her vacation with and ring in New Year's with.
They kept talking about it being like heaven and you could tell it couldn't get any better for them." “Demi loves spending time with Sean,” another source told .
"She shares his sense of fun and despite the age gap they get on brilliantly.
It is fair to say she has a penchant for younger guys.
But looking at them you wouldn’t know there was so much of an age gap. After a tough 2013 she now has a smile back on her face and it is a great way to start the New Year.
“As long as Demi’s happy, her children are happy for her.