LAKEWOOD, Colo. - There was a roar across Lakewood Friday morning as singer Katy Perry took to the stage at Lakewood High School for a concert.
More than 2,000 students started to pack the gym at 3 a.m. to see the singer perform on "Good Morning America."
She started with her hit Roar at 6:31 a.m. local time. As she performed, the 2,000+ students in the crowd sang along and took tons of photos and videos.
Perry, in a ponytail and a Lakewood High cheer outfit, jumped rope, sang and had a great time performing on her birthday.
"I'm 29 and I feel great," said Perry. "I still feel 13 sometimes."
In between songs, she called out to the students in different grades and was interviewed by Good Morning America's Sam Champion about her album, Prism.
Champion also showed off the jacket that Lakewood High wanted to give Perry.
Then Perry performed, "Walking on air," "Firework" and a medley of songs.
For Firework, she invited the kids to sing along and even let them sing parts of the song.
Perry picked Lakewood High School as the winner of a lip dub contest featuring her hit song, "Roar." A lip dub combines lip syncing and audio dubbing.
Lakewood High School's mascot is the tigers, so the idea of making a video to the name "Roar" seemed appropriate.
"For me, Lakewood really embodied a whole school spirit," Perry said when she picked the contest winner. "I think they brought everyone together and you saw so many different people coming together to do one shot."
More than 2,000 students from 80 different school clubs were involved in Lakewood High School's entry.
"It was so incredibly crafted," Perry said. "The clubs, the cliques, they all came together and did their own individual thing, but it was so interesting and well done and well organized."
Perry was impressed that so many kids at Lakewood High came together "to roar."
"That is what this competition embodies," Perry said.
Students at Lakewood told 7NEWS that they practiced several times before the big taping day because it had to be done in a single take.
"We had two weeks to plan, essentially one week and one week of rehearsal. So every single day of that week, I was walking through the school, I had my phone to my ear, listening to the song, walking through pacing of where everyone would be, taping the ground where each club would end. It took a lot of work," said Courtney Coddington, Lakewood's student body president and the one who rallied her school to make the video. "In two days of having the sign up sheet online for the clubs to sign up, we had 80 clubs and teams sign up. It was nuts -- 98 percent of the student body took part in the video."
After seeing the video last month, Perry Tweeted, "Oh my GAWD. Now this is what I call school SPIRIT: http://vimeo.com/75058173 I hear you roaring LAKEWOOD HIGH!"
Lakewood High School has 2,039 students. The school is perennially ranked by 5280 Magazine as one of the top high schools in the metro area, according to JeffCo Schools.
ABC -TV crews spent several days transforming the school's gym into a TV studio and concert hall.
The school had wanted the concert to be held in a larger venue, as a fundraiser for flood relief, but that is no longer in the plans. After the concert Lakewood students will be selling "One World One Roar" T-shirts to help Colorado food victims.
Watch Lakewood High School's video below or here: http://vimeo.com/75058173