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The 55-year-old addressed the reports during the opening monologue on Wednesday's show.
"I was like, 'Oh, what happened? They seemed so happy,'" she said when explaining a magazine headline she saw that read "Ellen and Portia Marriage Crumbles."
"And then I was like, 'Wait, I'm Ellen,'" the comedienne quipped.
All kidding aside, the talk-show host's tone became more serious when she slammed the claims.
"It's so ridiculous to me," DeGeneres told the audience. "There's not one ounce of truth to any of it. I'm very happily married. In fact, the only thing we ever argue about is who loves who more. That is all. It really is true."