Fans just spotted Shawn Mendes at Harry Styles' concert and the reactions are *golden*

Just when we thought we'd seen all the best celeb sightings during the Love On Tour circuit, fans just spied Shawn Mendes at Harry Styles' concert in LA—and the reactions are golden.

It's safe to say the celebrities of the world are as big Styles stans as we all are, with Harry's "Love On Tour" providing us with a number of viral moments of A-listers belting out the lyrics to Watermelon Sugar, alongside fellow fans. To name just a few, the likes of Kendall, Kylie and Hailey Bieber, Billie Eilish and BTS have all been spotted bopping along in the stands.

But, this latest sighting of a buzz-cut repping star at Harry's last gig in Inglewood CA show has sent the internet into somewhat of a frenzy.

Yes, on January 29th, Shawn Mendes (who previously dated Camila Cabello) was spotted kicking back at Harry's show and the fandom reactions are everything...

@twhitefields5400

♬ As It Was - Harry Styles

@slaylouie28

♬ Beautiful Boy (Darling Boy) - Ultimate Mix - John Lennon

Best reactions to Shawn Mendes at Harry Styles' concert

There's just something so wholesome about musicians supporting musicians, especially when said singers are usually pipped against each other in the pop awards categories—not to mention their fans being somewhat divided over whose songs/voices are the best and so on.

This is why, one fan summed the Shawn sighting up pretty well, tweeting: "Shawn Mendes went to Harry’s show tonight. My 2 worlds are colliding."

As did another, who dubbed it their 'multiverse of madness'.

@graceheartsharry

♬ original sound - grace

Others were just gobsmacked to see Shawn (and his new hair) in general...

With another tweeting a very good point: "shawn mendes at harry’s show. i’m waiting for the duet now." Can you imagine?

While another concert-goer had a night to remember, with both Harry and Shawn making eye contact and waving at her: "Perceived by Harry Styles and Shawn Mendes in the same night don’t speak to me." It's her world and we're all just living in it right now.

Some Styles stans also took their FOMO out on poor Shawn, with one writing: "shawn mendes is going to hear fine line and i am not. what did i ever do to deserve this treatment."

While another fan wrote: "shawn mendes is there AND his hitties are out???? i’m totally not jealous". Forgive us if we're wrong, but we're assuming 'hitties' translates to Harry's 'titties'...so yeah, the jealousy is valid here.

It really was the crossover we didn't know we needed and keeping our fingers crossed that a collab could follow one day...