GUY & DELTA'S FLIRT FEST!

THE COACHES CAN’T KEEP THEIR EYES OFF EACH OTHER

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They’re rival coaches on the hit show, but behind the scenes, Guy Sebastian and Delta Goodrem’s close relationship is raising a few eyebrows.

While in past seasons the singers have relished their friendly competition, this year New Idea has learned the former couple has grown closer than ever.

Now, an on-set insider reveals the pair’s closeness caused some serious tension backstage – particularly with fellow coach Kelly Rowland.

“Kelly got so frustrated as she couldn’t break the Guy-Delta bond and alliance,” the source explains.