Justin Bieber surprises a superfan ten years after serenading her with One Less Lonely Girl on stage

Justin Bieber and super-fan Lynsey Mickolas just reunited a full decade after he first serenaded her with his hit One Less Lonely Girl in concert in 2010.

The Canadian crooner, 25, surprised Mickolas yet once more during a special moment in the finale on his YouTube docuseries Seasons.

While Lynsey recounted her unforgettable Bieber moment, the pop star prepped for another very, very special performance.

Before Justin’s surprise Mickolas, now a forensic chemist living in Virginia, described her August 31, 2010 night at Madison Square Garden.

Years after, it seemed unreal for the fan who told cameras: ‘To be honest, I don’t remember everything from that night because everything just happened so quickly and it was so overwhelming.’

‘Allison [Bieber’s manager] just brings me backstage. She was like, “You’re going to be his One Less Lonely Girl” and I was like, “What?”‘

All the while, Justin is preparing to meet Lynsey again.

Despite being used to the spotlight, the Yummy singer couldn’t mask his nerves, telling cameras: ‘I’m nervous. I don’t know. It’s, like, the opposite thing to do. Like, why am I nervous? … She has no idea I’m here.’

But he looked composed as ever while interrupting her interview.

Justin swooped in as Linsey offered her opinion on Bieber’s last album Purpose.

Creeping up behind his fan, the What Do you Mean singer said: ‘Honestly, the Purpose album was really good. But, like, One Less Lonely Girl is definitely up there.’

‘Did you say, “Once a Belieber, always a Belieber?”‘ her went on while a shocked Mickolas turned around to agree.

The pair hugged before a backstage clip from 2010 rolled.

‘Look at how adorable we are,’ Bieber said. ‘We’re so young! You did not expect that, I’m sure.’ 

The Seasons finale was full of special appearances.

Fellow pop star Billie Eilish also appeared, saying she cares about Bieber ‘more than anyone in my life.’ 

The admitted Bieber fangirl joined the likes of Big Sean, Usher, Quavo, and DJ Khaled to praise the Canadian pop star’s progress.

‘I would say that he’s doing better,’ she told cameras. ‘And that makes me so happy because I, like, care about him more than anyone in my life.’

She went on to say she’ll back ‘anything’ Bieber has in store.

‘Anything that he makes at all, I’m excited about,’ Billie declared. 

‘I don’t care if he pooped and put it on a plate and put that in a store, I’m excited,’ she laughed. ‘Anything that Justin makes, I’m ready to go!’

Billie’s appearance in Seasons is after Bieber opened up about his protective feelings towards the 18-year-old singer.

Justin told Apple Music’s Beats 1: ‘[I’ll] let her do her thing and if she ever needs me, I’m gonna be here for her. Just protecting those moments because people take for granted encounters.’

He’s no stranger to early fame, as he received his breakout at age 13 after being discovered by Scooter Braun and Usher.

Bieber continued: ‘I just wanna protect her, you know? I don’t want her to lose it. 

‘I don’t want her to go through anything I went through. I don’t wish that upon anybody. So if she ever needs me, I’m just a call away.’

Eilish posted the clip to her Instagram, accompanied by photos of her childhood bedroom adorned with posters of Bieber.

She also shared a throwback snap of herself sporting a sleeveless white t-shirt printed with his autograph.

The Bad Guy artist also promoted Bieber’s first new album in five years, writing in the caption: ‘stream changes.’

He released the new album on Valentine’s Day, recently promoting it with a performance on Saturday Night Live.