The 41-year-old musician, who has been dating the "Hollaback Girl" singer for three years, believes the couple would be closer to saying their 'I dos' as and when the time is right.
"I think about (marrying her). I don't think it's anytime soon or anything.
"The more time that goes by, I guess, the closer you'd be getting to that," Shelton told CMT.
Stefani, who has Kingston, 11, Zuma, nine, and Apollo, four with ex-husband Gavin Rossdale, started dating the singer in 2015 after her split.
Shelton was earlier in a relationship with singer Miranda Lambert.
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