Demi Lovato may find boyfriend Wilmer Valderrama 'inspiring' and 'incredible' but that doesn’t mean the pair are engaged. Rumours started circulating that the couple were ready to tie the knot after Lovato instagramed a picture of herself where a ring on her engagement finger can be seen.

Demi Lovato at the X-Factor season 3 finaleDemi Lovato at the X-Factor season 3 finale

The 21 year old singer posted the full length picture, where her ring is clearly visible, with a caption underneath reading, 'Sooooo I don't think I've ever been happier in my life than this very moment that I am fully living in….’ The photo and accompanying caption sent fans into a frenzy wondering if the 34 year old actor had proposed. However a rep for Lovato has quashed rumours saying there was no truth behind the engagement rumours.

Wilmer celebrated his 34th birthday last Thursday and Lovato took to Twitter to show her love for the actor tweeting, “To the funniest, most inspiring, incredible man I know.. @WValderrama - thank you for helping me get through my darkest moments.. You truly are a light to this world and to my life.. Happy Birthday!!!” She also added a photo collage of the pair. The couple have been dating on and off since 2010 but things became serious again in February 2013. The engagement was first speculated about in December after Valderrama was seen shopping for a ring for Demi at Tiffany and Co.

Wilmer Valderrama at the Environmental Media Awards in October 2013Wilmer Valderrama at the Environmental Media Awards in October 2013

Both Lovato and Valderrama have a colourful romantic past which has been played out in the media. Lovato previously dated Joe Jonas who recently wrote about ‘smoking pot’ with the singer. Lovato entered a treatment facility for "physical and emotional issues” in October 2010 staying until January. She has since spoken out about her drug and alcohol issues as well as mental health problems. Valderrama was previously known for his relationships with Lindsay Lohan as well as Mandy Moore.