The 'Neon Lights' singer, who usually likes to keep her relationship private, caved in yesterday after she admitted she was missing her man while here in the UK.
Sharing a photo of herself and Wilmer looking super loved-up, Demi can be seen smiling cutely as her beau plants a kiss on her cheek.
Captioning her photo, Demi said: "I never post personal pictures like this but f***.. He is perfect. I miss my @wilmervalderrama."
With Demi constantly performing all over the world, the Disney starlet is often forced to spend time away from Wilmer.
And, it seems absence does make the heart grow fonder for Demi, as when the distance gets a bit too much for the 22-year-old, she has been known to indulge in a little PDA.
Back in September, Demi shared another cute photo of herself and Wilmer while she was away touring on her 'Demi World Tour'.
In the snap, the US beauty and her boyfriend are pictured sleeping. Alongside her photo, she wrote: "#TBT to that one time we had an hour to kill before our movie so we went to the furniture store and took a nap..... missing you."
Demi's latest comments about her other half come as she is currently in Europe to support Enrique Iglesias on his 'Sex And Love' tour.
Stopping over in London earlier this week, Demi looked like a total princess as she attended the Royal Variety Performance.
The former X Factor USA judge dazzled in her royalty-inspired dress, before she took to the stage to perform at the London Palladium in front of Prince William and Kate Middleton.
Other performers on the night included One Direction, Ed Sheeran, Ellie Goulding and Britain's Got Talent winners Collabro.
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Watch Demi's video for 'Neon Lights' here: