Angie Johnson was "seriously on Cloud 9" Tuesday. "Whose life am I living?" she wondered, the day after 17.7 million people watched her belt out Pat Benatar's "Heartbreaker" on NBC's "The Voice."

Air Force Staff Sgt. Johnson, 31, who grew up in St. Ann, already had a major claim to fame: a video of her singing Adele's "Rolling in the Deep" on a loading dock in Afghanistan that racked up 2.4 million views on You Tube and led to guest appearances on "Ellen DeGeneres" and "Entertainment Tonight."

But her audience just keeps getting bigger. Now Johnson will compete on NBC's popular "The Voice" as a member of judge-mentor Cee Lo Green's team. Green chose her after hearing "Heartbreaker," saying, "I love a woman with guts, with power, with confidence."

Tuesday afternoon, after a day of interviews, Johnson (Ritenour High School, Class of 1998) said her feet still hadn't touched the ground and she was running on adrenaline. She watched her episode of "The Voice" in Nashville, where she now lives, with family and friends and said that "even though it already happened, and I even knew the outcome, it was like watching a movie." Afterward, "I bawled my eyes out"; a photo on her Facebook page shows her in the center of a group hug.

Johnson chose "Heartbreaker" as her audition song after considering what specific judges liked, she said. "I knew Cee Lo liked Pat Benatar," and in fact he was the only judge to hit his button and turn his chair around, the signal on "The Voice" that a judge wants a particular person on his or her team.

"Gosh, no," Johnson said when asked if she'd been at all disappointed that only one judge recruited her. "I only needed one. That was my ticket to go on to the rest of the show." She hadn't hoped for one judge over another, she said; "I didn't want to be disappointed."

Besides, she said, "I can die happy now that Christina Aguilera said I had great pitch. And Adam Levine said I was attractive."

Johnson spent two months in Iraq and Afghanistan last summer as a member of the St. Louis-based Air National Guard band Sidewinder, which played for troops at military bases and hospitals. The band was performing an impromptu acoustic set when rehearsing when an audience member shot the video and uploaded it to You Tube.

Carson Daly, host of "The Voice," saw the You Tube video and reached out to Johnson via Twitter, urging her to audition. "It happened so quickly," Johnson said. "He didn't even know who I was, and a day later I was tweeting with him."

Producers recruited some singers, including Johnson, to  perform at the auditions. Johnson was chosen by Green as one of a team that will eventually number 12 people. The three other judges will also mount teams of 12.

Johnson doesn't know how soon she'll be called back to compete again on "The Voice," but she's ready. "I can pack really fast," she said.

And she has a friend in Daly, who wrote on Twitter after Monday night's show:

@angiekjohnson you were great- got such great remarks tonight about our story- I'm honored. You have so many new fans- you've already won:)

— Carson Daly (@carsonjdaly) February 7, 2012

"The Voice," 7 p.m. Monday on NBC

Angie Johnson's "Heartbreaker" is available on iTunes. Or listen at www.nbc.com/the-voice

Auditions for Season 3 of "The Voice" begin March 3 in Chicago. Video applications are also accepted. Info: www.nbcthevoice.com.