Ryan Seacrest’s Idol Obsession With Carrie Underwood Riles Up Jealous Hubby Mike Fisher

Effusive host Ryan Seacrest is fawning over Carrie Underwood amid the former American Idol champ’s return as a judge on the TV contest that made her a star — but the emcee’s nonstop attention has ruffled the feathers of the songbird’s jealous hubby, Mike Fisher, sources spill.

According to a tipster, ­savvy Seacrest was instrumental in hiring the Cowboy Casanova hitmaker as a replacement for Katy Perry, who quit last year, and has been “incredibly protective” of her!

The insider dishes, “Ryan’s always been fond of Carrie — ever since she competed on American Idol 20 years ago. He thinks she’s extremely talented, and he’s proud of the success she’s had.”

The spy squeals that gentlemanly Seacrest “would never dream of crossing the line,” but his attention toward the Grammy-winning gal is making retired hockey hunk Mike “feel threatened!”

The source gabs, “he can see for himself that Ryan’s swooning over her and doesn’t like it all! And the fact that Carrie can’t stop talking about the guy is enough to get his dander up!”

The former NHL player, 44, recently made a rare red-carpet appearance with his wife of nearly 15 years at Nashville’s Grand Ole Opry — not far from the 400-acre estate where the couple is raising their sons, Isaiah, 10, and Jacob, 6.

The insider chuckles that Carrie “just rolls her eyes” when he husband vents about media mogul Ryan — because she thinks of Seacrest as a sibling and appreciates having someone in her corner on the show!

Fellow judges Lionel Richie and Luke Bryan are cordial enough — but they’re too busy to give Carrie the extra attention she needs in her new role, the source says.

“Ryan is always there to assist when she has a question. It’s nice to know he’s there and has her back,” the insider explains. “She thinks the world of him. He’s a phenomenal success, and she looks up to him.

“It puts Carrie in an awkward position. She likes Ryan — but she doesn’t want to give Mike the impression that she’s being disrespectful to him.”

Yet, the country cutie “can’t help” gushing about Seacrest in front of her spouse, says the source, who adds, “She’s doing nothing that she should be ashamed of — so Mike should stop worrying!”

Yet, the source says that protective Fisher “won’t hesitate” to give Ryan a piece of his mind “if he encroaches on Mike’s territory any more than he already has!”