Nick Jonas and Demi Lovato sang for young hospital patients on a surprise visit.
The two singers - whose joint 'Future Now' tour begins in June - made a shock appearance at Children's Hospital Los Angeles on March 16 and thrilled the youngsters and their parents with an intimate performance.
Video footage just shared on the hospital's Facebook page showed Nick accompanying Demi on an acoustic rendition of her song 'Confident', while she then harmonised and clapped along as her pal performed 'Jealous'.
And after the surprise show, the two stars, both 23, happily posed for pictures and signed autographs.
The hospital were thrilled to have the famous visitors.
They said on their page: "Anytime someone stops by their room, it makes them feel a little special. We're lucky to have Demi, Nick and many others visit...
"It was a pretty awesome experience for our patients!"
The visit was to raise awareness for the #MakeMarchMatter fundraising campaign, which seeks to raise more than $1 million for the facility.
The day before Demi visited the hospital with Nick, she celebrated being sober for four years.
The 'Cool for the Summer' singer - who checked into rehab in 2010 at the age of 19 to be treated for alcohol and drug abuse, as well as an eating disorder and persistent self-harming - tweeted: "This last year I experienced so much life and too much death ... But I made it through ... Sober. #4Years #GodsWill (sic)
"Most people die but others just go ... She's still out there and the chasm grows ... Steady are the feet in the morning glow. (sic)
"I can't believe I have 4 years on Tuesday ... Anything is possible."