Carly Rae Jepsen on her "Cinderella" experience, Justin Beiber

(CBS News) Last year, she watched The Grammys at home in her pajamas, and now her pop hit phenomenon song is nominated for Song of the Year and Best Pop Vocals. 27-year-old Carly Rae Jepson' s "Call Me Maybe" was the one song that you couldn't escape last year. It was spoofed by celebrities, sports teams, and even former Secretary of State Colin Powell got into the spirit when he sang it on "CBS This Morning."

The song itself had a nine-week arc atop the Billboard Hot 100 chart, and has sold more than 6.7 million tracks in the United States, according to Nielsen Soundscan. And it wasn't even supposed to be part of the album -- the lyric was filler. Jepsen said she's a songwriter at heart, and that when she recorded it, she thought, "Whatever happens, happens."

Justin Bieber first heard Jepsen's "Call Me Maybe" on the radio when he was washing dishes at his mom's house near Stratford, Ontario. He tweeted about it to his 29 million followers and then made a video spoof with his friends, including Selena Gomez. Jepsen has since signed with Bieber's manager, Schoolboy Records founder Scooter Braun, and toured with him in front of sold-out crowds around the world.

"It was exhilarating, I had no idea what was hitting me," Jepsen told Gayle King on "CBS This Morning." "I remember in the very beginning, when he originally tweeted and I remember thinking, it's too good to be true so I didn't tell anybody about it."

Even with the new dress code at the Grammys, Jepsen told King she's looking forward to feeling like more like Cinderella, to "wear a dress and go to this big ball event" rather than watching from home in her pajamas.

For Carly Rae Jepsen's full interview, watch the video above.