The two have officially been dating for over a year now, and on Friday's episode of The Ellen DeGeneres Show, the 40-year-old country crooner shares why he's so over the moon for the 47-year-old No Doubt front woman.
"It's just been an eye opener to be with someone like her," Shelton -- who divorced Miranda Lambert in the summer of last year -- explains. "Believe it or not, I mean, you think Gwen Stefani and No Doubt, she's literally may be the most normal person that I have ever met in my entire life."
The feelings are mutual for Stefani -- who also went through a divorce with Gavin Rossdale last year. When speaking to ET at Glamour's Women of the Year Awards last month, she had nothing but praise for Shelton. "It's incredible to have a best friend like that guy," she said. "He's an amazing person."