Blake Shelton's friend Luke Bryan is amazed he's "scored" Gwen Stefani.

Blake Shelton

Blake Shelton

The country singer recently found love with his fellow 'Voice USA' coach following the breakdown of his marriage to Miranda Lambert and his old friend can't believe he's romancing the No Doubt singer.

He said: "I laugh at how the hell he scored Gwen. What I love is the thing that came out, that she didn't know who the hell he was before 'The Voice'. I was like, 'Well, she was lucky back then.'"

Despite his jokes, the 'Home Alone Tonight' singer insists he is very pleased for his friend and thinks his relationship with Gwen - who split from husband Gavin Rossdale, the father of her three sons, earlier this year - is a good thing.

He added in an interview with 'Entertainment Tonight': "The whole thing with relationship is enjoy it and have fun. They're having fun and that's a good thing."

Gwen, 46, recently admitted she had never heard of Blake until she joined 'The Voice'.

She said: "I didn't even know who [Blake] was.

"Before I was on 'The Voice' I never heard of him before. I'm an O.C. girl! Like, what would I know?"