'We can accomplish big goals': Demi Lovato speaks to the U.N... with her Smurfs cartoon co-stars in attendance

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Being invited to speak to the United Nations is no small feat.

And Demi Lovato had two very special guests when she swung by the U.N. headquarters in New York on Friday - her co-stars from Smurfs: The Lost Village.

Mandy Patinkin and Joe Manganiello joined her at the event celebrating the International Day Of Happiness and plugging the #SmallSmurfsBigGoals campaign.

'Every one of us, even a Small Smurf, can accomplish big goals,' said the 24-year-old singer and actress.

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Guests of honor: Demi Lovato swung by the United Nations headquarters in New York City on Friday with two of her co-stars from Smurfs: The Lost Village

She'd spent a bit of time posing on a blue carpet outside the actual ceremony before taking the podium in the vast General Assembly Chamber.

Demi, who recently celebrated five years' sobriety, had slid on a simple sleeveless white dress cut off above the knee, teamed with matching ankle-strap stilettos.

Her hair was cropped above the shoulders, and she stood for carpet photographs beside someone dressed as Smurfette, the character she voices in the film.

Dream team: Mandy Patinkin and Joe Manganiello had joined her at the event celebrating the International Day Of Happiness and plugging the #SmallSmurfsBigGoals campaign

Alter ego: Her hair was cropped above the shoulders, and she stood for carpet photographs beside someone dressed as Smurfette, the character she voices in the film 

Manganiello had turned up in a navy suit elegantly fitted to his muscled build, popping on a complementary tie and black dress shoes.

Meanwhile, the Homeland actor had opted for a black suit he'd teamed with a black dress shirt, leaving his top button undone and doing without a tie.

Patinkin plays Papa Smurf in the film, while the husband of Sofia Vergara plays a Smurf called Hefty, and people dressed as both characters trod the carpet as well.

Patinkin plays Papa Smurf in the film, while the husband of Sofia Vergara plays a Smurf called Hefty, and people dressed as both characters trod the carpet as well

Mingling: The screen stars and Smurfs also got themselves photographed alongside Cristina Gallach, Under-Secretary-General For Communications And Public Information

The screen stars and Smurfs also got themselves photographed alongside Cristina Gallach, Under-Secretary-General For Communications And Public Information.

Patinkin, like Lovato, spoke onstage at the establishment's headquarters, where the UN News Centre reports 1,500 international Model UN students had gathered. 

The bash, in part, lavished praise and 'keys' to Smurf Village on three students who'd contributed to the 17 Sustainable Development Goals the UN has set.

Lovato spent a bit of time posing on a blue carpet outside the actual ceremony before taking the podium in the vast General Assembly Chamber

Coordinated: The Cool For The Summer singer had slid on a simple sleeveless white dress cut off above the knee, teamed with matching ankle-strap stilettos

'On behalf of all Smurfdom,' Patinkin thanked the honorees 'for your work in awakening everything, in your community, through you social media, all over the world, in the ways that you have chosen to encourage people everywhere to make this world a better place for those who are so vulnerable in every way imaginable.'

He counseled: 'Never be afraid to speak up and to make this world a wonderful, beautiful, hopeful, optimistic place full of freedom, joy, justice and dignity, good food, good water, good opportunities for people everywhere, forever.'

These development objectives, which the UN has abbreviated as SDGs, were featured on signs which the celebrity guests had been given to pose with at the fête.

Addressing the crowd: Patinkin, like Lovato, spoke onstage at the headquarters, where the UN News Centre reports 1,500 international Model UN students had gathered

Credit where it's due: The bash, in part, lavished praise and 'keys' to Smurf Village on three students who'd contributed to the 17 Sustainable Development Goals the UN has set

On-brand: 'On behalf of all Smurfdom,' Patinkin thanked the honorees 'for your work in awakening everything' and helping 'make this world a better place'

Manganiello's vaunted No. 1: 'NO POVERTY,' while Lovato's promoted No. 3: 'GOOD HEALTH AND WELL-BEING' and Patinkin's No. 13: 'CLIMATE ACTION.'

Directed by Kelly Asbury, Smurfs: The Lost Village is rebooting the film franchise and boasts a cast that includes Rainn Wilson and Jack McBrayer.

Out April 7, it's also got voice work from a cavalcade of celebrities ranging from Gordon Ramsay and Ellie Kemper to Julia Roberts and Jeff Dunham.

The film: Directed by Kelly Asbury, Smurfs: The Lost Village is rebooting the film franchise and boasts a cast that includes Rainn Wilson and Jack McBrayer

Waiting for the release: Out April 7, it's also got voice work from a cavalcade of celebrities ranging from Gordon Ramsay and Ellie Kemper to Julia Roberts and Jeff Dunham