[Photo by: Awsten Knight/Giselle Dias; 5 Seconds Of Summer/Alexandra Gavillet]

Waterparks frontman Awsten Knight onstage with 5 Seconds Of Summer is the best thing you'll see all day.

Watch videos of the performance below!

Read more: QUIZ: How well do you know the lyrics to 5 Seconds Of Summer's “Good Girls”?

Knight performed 5SOS' hit “She's Kinda Hot” at the Houston, Texas, date of the Australian band's tour on April 21, and it was so incredible we almost wrote this story in all caps.

After the concert, Knight shared a heartwarming tweet, explaining he used to teach 5SOS songs before Waterparks got signed.

“LAST NIGHT I GOT TO SING WITH THEM AT THE SHOW,” he wrote. “& IT WAS THE COOLEST THING IN THE WORLD. 

Fans were really, really proud and had some incredible reactions.

Knight posted a picture that made us tear up a little bit, and we wonder if he plans on changing his Instagram bio anytime soon.

5SOS also shared the picture on their account with the caption “YOUR FAVORITE BAND.” Honestly? Yes.

 

‪“CONTRARY TO POPULAR BELIEF I’M NOT IN 5 SECONDS OF SUMMER.”‬

Uma publicação compartilhada por Awsten Knight (@awstenknight) em

There are videos of the moment too, which you can watch below.

After all that, only one question remains: When are Waterparks and 5SOS touring together?

5 Seconds Of Summer are currently on tour in support on their new record, Youngblood, out June 22

“Finally… It’s been 3 years since our last album and we are so ready to share new music with the world,” 5SOS told fans with the release of their first new single, “Want You Back.” 

“After spending the last 5 years on the road since the age of 16, it was important we took time to reflect as individuals and now we’re coming back stronger and more unified than ever. These songs mean the world to us and we have held nothing back in writing and recording this album. We’ve been rehearsing a lot of the new songs live and can’t wait to get back out on tour to connect with our incredible fans.”

Watch more: APMAs 2017 Best Breakthrough Artist: WATERPARKS