In celebration of Independence Day, 'American Idol' judge Katy Perry took to Twitter to mark the Fourth of July — but her "cryptic" post left fans confused.

Katy Perry's "Firework" was co-written by one of the most important songwriters working in the business today. She revealed what it was like to work with the "California Gurls" singer.

Katy Perry wrote "Firework" after another celebrity introduced her to a passage from a famous American novel. The song became a massive hit.

Looks like we’ve been getting the lyrics to one of Katy Perry’s biggest hits wrong for years. The singer's song "Firework" has become a feel-good anthem and a Fourth of July staple since its ...

In a tweet, Katy Perry wrote, “‘Baby you’re a firework’ is a 10 but women in the US have fewer rights than an actual sparkler smh.” It’s clear that the singer used her 2010 hit ...

Katy Perry is owning the night like the Fourth of July. The Teenage Dream hitmaker shared a patriotic photo on Instagram, paying tribute to her 2010 song "Firework." In the photo, Perry, 39, poses ...

The video for “Firework,” the third single and third #1 hit from Katy Perry’s 2010 leviathan Teenage Dream, is an utterly deranged piece of filmmaking.

Despite these two songs being widely favored across the country, Katy Perry's "Firework" is searched for more in 25 states, including Washington D.C.

The smash ending to a smash day in Washington, D.C., on Wednesday was Katy Perry singing “Firework” as, appropriately enough, fireworks went off around the Washington Monument behind her. Many ...

Katy Perry celebrated the Fourth of July with a patriotic photo and paid tribute to her hit 2010 song "Firework" on Instagram. The singer is set to release her single 'Woman's World' on Thursday ...