Demi Lovato and Nick Jonas proved they are all heart over the weekend as they treated employees from Pulse nightclub in Orlando to a very special concert.

A Facebook post on the club’s account yesterday revealed that the former Disney stars surprised the venue’s staff with free tickets to their sell-out show and to a meet and greet before it began.

The post – which was accompanied by a picture of those involved – said: “Nick Jonas & Demi Lovato, thank you for making the Pulse family smile #onepulse #orlandostrong #pulseorlando.”

A later share showed staff members in a human pyramid and was captioned: “We will rise and not be defeated! #onepulse #pulseorlando.”

According to TMZ, around 30 employees were also given a private suite at the Amway Centre where the concert was being held.

During the show, Demi and Nick – who are currently travelling together as part of their joint Honda Civic Tour – again paid tribute to those lost in what’s been called the worst mass shooting in US history.

As they were joined on stage by Andra Day to sing Rise Up, the names and ages of the Orlando shooting victims were shown on a big screen.

The move comes almost a month after lone gunman Omar Mateen took the lived of 49 people when he opened fire in the popular gay nightclub.