Demi Lovato celebrated her birthday at Disneyland.

The 'Heart Attack' hitmaker sported a Darth Vader Mickey Ears helmet and a matching T-shirt as she paid a visit to the adventure park in Anaheim, California, on Wednesday (20.08.14) to mark her 22nd milestone.

The stunning star was also joined by her boyfriend Wilmer Valderrama, 30, whom she has been dating on/off since 2010, at the attraction.

Not only did the 'That's '70s Show' star spend the entire day with the singer, he also made sure his Instagram fans knew that it was his beau's birthday as well.

Taking to his Instagram account after their trip, he wrote: ''Wishing you happy birthday would never come close to all the inspiring things I wish for your life.. We laugh our asses off.. While we do all we can do better everything around us... Love you through all. (sic).''

Meanwhile, Demi - who has battled drug and alcohol addiction and an eating disorder in the past - recently admitted she would only date ''mature men'' who can deal with her emotional complexities.

She said previously: ''I would be slightly overwhelming for somebody who is not at a level of maturity to support me mentally.''