The country star has been dating the No Doubt singer for almost two years
Blake and Gwen have been together for two years
Appearing on an episode that will air Friday, the 41-year-old singer talked with the host about his newly acquired sex symbol status could upstage his the lead singer of No Doubt, for whom Blake quipped this will all be 'humbling.'
He said: "You know, it's - I feel bad for her.
"You know, because she has been in the spotlight, and this symbol of beauty."
Blake gestured prompting the 59-year-old chat-show hostess to finish the point: "And now you're overshadowing her."
Ellen jokingly predicted Blake's new title will 'be a strain' on the romance, to which Blake replied: "I know. I know. You know what? It's gonna be humbling. It's gonna be humbling for her, but I think she's got a big enough heart. She can deal with it."
"She's got a good personality and that's all that counts," Ellen joked.
Blake also referenced his The Voice co-judge and Maroon 5 lead singer Adam Levine who received People’s Sexiest Man Alive accolade four years ago and quipped: "He’s not happy."
Following the news, Gwen tweeted a photo of her and her boyfriend of almost two years kissing with the caption: "I guess I’ve been kissing the #sexiestmanalive all this time but @people I knew that already."
Gwen and Blake began dating after the No Doubt singer split from her former husband Gavin Rossdale amid claims he had cheated on her with their nanny.
Stefani has three sons with Rossdale: Kingston James McGregor Rossdale born on May 26, 2006, Zuma Nesta Rock Rossdale born on August 21, 2008 and Apollo Bowie Flynn Rossdale born February 28, 2014.
Blake Shelton was married to Miranda Lambert before the pair divorced in July 2015.