Katy Perry, Ke$ha Introduce Pop's 'American Girl,' Bonnie McKee

Famed songwriter drops her first music video with the help of friends like Carly Rae Jepsen and Macklemore.

Even if you don't know Bonnie McKee by name, you know her music. She's the woman behind some of your favorite pop songs from the likes of Britney Spears, Katy Perry and Ke$ha. Now, the chart-topping songwriter is launching her own solo career, and she's taking some of her A-list friends along for the ride.

McKee just dropped the video for her high-energy, slightly cheeky single, "American Girl." The video features cameos from Perry (who lies in bed in her PJs while clutching a teddy bear), Adam Lambert, Ke$ha, Taio Cruz and Carly Rae Jepsen, whom she has worked with in the past. It also stars Macklemore, Karmin, Jewel, Becky G, Jason Derulo and Nicole Scherzinger and has some unexpected cameos from Kiss, comedian Joan Rivers, and "Star Trek" star George Takei. And, yes, Bonnie's in the clip too — eating a cheeseburger and a Popsicle, and wearing American flag pants.

Thanks to the A-list cameos, the video had amassed nearly 180,000 views in its first day.

While it's unclear how she managed to get that many stars from all walks of life in the video, her connection to a number of the cameo-makers is undeniable. She's helped write some of Perry's biggest hits including "Part of Me," "Wide Awake," "Teenage Dream," "Last Friday Night (T.G.I.F.)" and "California Gurls."

Then last year, she worked with Jepsen on her album Kiss on the song "Turn Me Up." She just worked with Ke$ha on her 2012 release Warrior, including tunes "Supernatural" and "C'Mon." And, she hit the studio with Lambert for two tracks off his Trespassing album, "Cuckoo" and "Chokehold."

Having had a hand in seven #1 singles, Perry might not be wrong when she confesses at the end of the video that not only is the ginger-haired singer an American girl, but she's also her competition.

MTV News spoke to McKee back in February 2012, ahead of the release of Perry's Teenage Dream re-release and she explained what it's like for the two of them in the studio. "I'm working with Katy and it's great," she said. "I'm really excited and I think everyone is going to really relate to and love what she's doing next. It's kind of a departure from what she's been doing in the past. We are a great team when we write together because we don't let each other settle; every single line is a philosophical debate."