LOS ANGELES: Demi Lovato told fans life can be 'really funny' after opening up about breaking her sobriety.

The 'Sober' singer - who had celebrated six years without a drink earlier this year - apologised to her loved ones in her emotional new track on Thursday, and later addressed her audience on stage in Barcelona, Spain that evening.

She told the crowd: ''Life is really, really funny sometimes. It can be difficult, but, for the most part, if you do what makes you happy and set yourself free, you'll live an amazing life.''

The 25-year-old star was performing live just hours after unveiling the candid and heartbreaking song to the world with an emotional lyric video.

On the touching track, Demi sings: ''Mama, I'm so sorry I'm not sober anymore, and Daddy please forgive me for the drinks spilled on the floor.

''To the ones who never left me, we've been down this road before. I'm so sorry, I'm not sober anymore.''–GN

She later apologises to her fans, and admits while she would like to be a good example for them she is ''only human''.

She croons: ''And I'm sorry for the fans I lost who watched me fall again. I wanna be a role model but I'm only human.''

Demi has been open publicly with her battles with addiction - and her stint in rehab in 2010 - and emotionally celebrated her six year milestone during a concert in March.

The following month, she was snapped drinking from a red cup at Hayley Kiyoko's album release party - but she was quick to shut down her critics who doubted her sobriety.

She replied on social media: ''I don't have to defend anything but it was red bull.''