Demi Lovato says she and Wilmer Valderrama are "disgustingly cute".

Demi Lovato and Wilmer Valderrama

Demi Lovato and Wilmer Valderrama

The singer and her actor boyfriend are currently on holiday together in St. Barts and Demi took to Instagram to gush about him.

She wrote: "Yes this is disgustingly cute. So happy I'm in love with such an incredible man."

Demi, 23, has always been vocal about her love for Wilmer, 35, and recently admitted she has never felt "more in love".

She gushed: "I've never been more in love. I'm so excited to have him in my life as my best friend and my boyfriend."

And she also said she is "grateful" for the 'That 70s Show' actor.

She said: "We don't share everything with the world. But we do feel comfortable to share a lot. With Wilmer and I and our relationship, he's extremely supportive in everything that I do. He makes me feel confident and beautiful. And I'm just really, really grateful for him."

Demi and Wilmer are so secure in their relationship that he didn't even mind when they bumped into her ex Joe Jonas and his brother Nick Jonas while on vacation.

Alongside a picture of the three guys, Demi wrote: "This picture makes me so happy. I love my boys."

And Wilmer, 35, also shared a picture of himself and his pals sitting on some steps.

He captioned the image: "SharingTheMoment with woes in St. Barts or St. Barths....Tomato...TomAto (sic)"