The Voice judge, who turns 46 on Oct. 3, talked about her reaction when she found out the NBC singing competition show won an Emmy for Outstanding Reality Competition Program at the 2015 Emmys last Sunday. Stefani did not attend the award show, stating that she had plans to spend time with her three children, Kingston, 9, Zuma, 7, and Apollo, 1.
"Seriously, my phone was blowing up. And they invited me like, the producers, and I was like, 'Well, I'm going to be with the boys that night and then I have to get a dress.' And I was like, I don't know," she told ETonline. "They're like, 'But we might win, and I was like, 'I hope so.' And then when they won I was like, 'I should have gone! What was I doing?! What was I thinking?!' You know, I could have been up there. But it's incredible and the show is so incredible and I cry every time I'm there because it's so emotional. I'm so grateful."
Upon hearing about the big win, Stefani shared an adorable smiling selfie on Instagram.
"Omg driving home and my phone is blowing up!!! @nbcthevoice we just won an #emmy !!!," she captioned the pic.
Stefani also shared that on this season of The Voice, she's not holding anything back -- she's ready for victory!
"They all have my back you know what I mean, in a weird way. And like, Pharrell, it's a little bit different because I feel like this time I can actually be a little more competitive with him," she said. "I'm pumped, like I'm ready, like I'm going to destroy them, like it's over. Like seriously right now, my competitive mode is like up."
This year has been a rollercoaster ride for Stefani, especially due to her split from husband and father of her three kids, Gavin Rossdale, in early August. Despite the recent heartbreak, Stefani has learned to be grateful, and said she's been focusing on looking good in order to feel good.
"I go day by day and I just kind of work it in the mirror," she explained. "I'm like, what do I do today? Today I'm doing light lips, people seem to like that, so I'm trying to like give it to you, know what I'm saying? Trying to give a little bit, think about you once in a while!"
The No Doubt frontwoman has also been keeping herself busy with her upcoming third solo album -- the first in nearly a decade -- and Stefani said she's been using good vibes from her fans on social media to fuel her energy in the studio.
"In the last two days I've written two songs ... ask anyone in the studio they were like, 'Is this happening right now, like how is this possible?' So thank you guys because whoever was watching me on Twitter or Instagram, like you were part of that,” she said. “I felt that."
Watch the video below to hear Stefani discuss more details about her new album when ET caught up with her earlier this month at the Four Seasons in Beverly Hills, California.