Watch Celine Dion sing-along backstage to Cher’s performance

At the 2017 Billboard Music awards two iconic divas took the stage to perform their classics from the past. While Celine brought the house down singing ‘My Heart Will Go On’ for the 20th anniversary of the song, Cher was honored with Billboard’s ICON award and delivered a two-song medley of ‘Believe/If I Could Turn Back Time’ before receiving the honor.

The 71 year old legend can still rock the crowd with her stage presence and pull a mean Cherilicious costume.

But another epic moment took place backstage as the ‘I Got You Babe’ songstress gave her first award-show performance in over 15 years.

While Cher sang her classics on stage, Celine Dion stopped by behind the curtains to move and groove watching her fellow performer. The Canadian singing legend jammed to Cher as she watched her performance from behind the stage on a monitor and went into an impromptu karaoke session.

Watch the video of the epic moment below: