United Kingdom, May 8 -- Blake Shelton's relationship with Gwen Stefani "still feels new".

The couple will celebrate their 10th anniversary together later this year but the 48-year-old country star admitted it doesn't feel like so much time has passed for himself and the No Doubt frontwoman, who he went on to marry in 2021.

He told People magazine: "It honestly does [feel like time is flying by]. Some of the things that we talk about, we're to the point in our relationship that it's like, 'Oh, remember what happened...' and you realise, 'Oh my God, that was eight years ago!'

"It's like, how did this happen so quickly?

"10 years is a long time [but the relationship] still feels new for me.

"I feel like that might be the key to happine...