The North Dakota-born singer became a member of Team Blake for season two following her blind audition performance of 'Stay' by Sugarland on Monday night (February 6).
Speaking to reporters on a conference call, she said: "Blake as my coach is the perfect fit. I have loved him from a long time ago, the days when he had longer hair! For him to even turn that chair around was an amazing experience for me.
"I was wrapped up in the moment and tried to stay in the moment. In some ways I forgot about where I was a little bit and then when Blake turned around I had a huge breath came up and through me - a sense of relief but also, 'Oh my gosh, Blake Shelton is looking at me and now I'm looking at him!'"
Sebastian said that she chose to perform 'Stay' because she wanted to remain close to her music roots and felt it was a track that the audience, coaches and viewers could connect with.
"It's a compelling song, there is so much emotion in it and whenever Jennifer Nettles sings it you just want to listen to it," she said. "I was hoping I could bring that to the song and live in the moment.
"I love the fact it's just an acoustic guitar when it's broken down and people can hopefully relate and connect, plus I love that song so that's why I picked it."
Sebastian told reporters that before auditioning for The Voice she had tried out for another singing competition, Nashville Star, and America's Got Talent, but didn't get a callback.
She added that she has no regrets about putting plans to start a family on hold so that she could pursue her musical dreams, saying that The Voice is the "most incredible" opportunity she has gotten.
"It's the most incredible thing that's ever happened to me and watching the episode was like reliving that moment," she said. "It just really sunk in. I'm so happy that I have made that decision."
As for her thoughts on the bickering coaches, she said: "I think each coach is extremely passionate about what they do and I think they are really passionate about being on this show and helping us succeed. Maybe sometimes they are looking at us and seeing a little bit of themselves, because they all started where we did too.
"It can be a long process and a hard road to travel , but's the same dream we all share and the passion will definitely come out when they're interacting for each other. Plus, they're there to have some fun too! I enjoy watching them interact - it's fun!"
The Voice airs Mondays at 8/7c on NBC.
Watch Gwen Sebastian introduce herself below: