ELLEN DEGENERES is now TVs highest-rated and most beloved talk-show host – but her incred­ible success is destroying her marriage to her gorgeous wife, Portia de Rossi!

Insiders say the women, who were wed in 2008, are being driven further and fur­ther apart as Ellen’s career continues to soar to new heights.

“Sadly, Ellen and Portia’s re­lationship is quickly becoming just another typical Hollywood cliché,” a source close to the couple told The ENQUIRER. “The more success and wealth they accumulate, the deeper the wedge between them.”

As The ENQUIRER REPORTED in June, Ellen, 54, who rakes in a reported $45 million a year, has become obsessed with purchas­ing real estate as a way to fill the void in her relationship with Por­tia, 39. A year ago, she shelled out $12 million for Brad Pitt’s former Mal­ibu home – then sold it in August for $13 million. She also dropped another $18 million for an 8,500-square-foot mansion in Beverly Hills after selling her massive estate, also in Beverly Hills, to Ryan Seacrest.

“Ellen is grasping at straws in her des­perate attempt to keep Portia happy by amassing all of that wealth, but it’s be­coming blatantly obvious that it’s forcing them further apart,” said the source.

“At this point, the only thing that’s go­ing to save Ellen and Portia’s relationship is to find a way to make Ellen’s success secondary to what really matters – their love for each other.”