(Cover) - EN Showbiz - Lady Gaga has been embroiled in a love triangle after reports that she "stole" new love Taylor Kinney from his ex-girlfriend.

The Bad Romance singer and her new beau, who is featured in her video You & I, are said to be getting along great.

But Star magazine reports that Taylor dumped 26-year-old real estate agent Brittany Sackett to be with the famous performer.

"Gaga was with Brittany's boyfriend and Brittany found out he was cheating on her," an insider told the publication.

Taylor, who is an actor, apparently "told Gaga he had a girlfriend," the friend said. "He never tried to hide it, but Gaga didn't care."

Brittany apparently found out in a very odd way that Taylor was now seeing the Poker Face star.

"Brittany told me, I got a pocket dial from him and recognised Lady Gaga's voice,'" the insider stated. "Brittany went on saying, I heard them making out. She was saying to him, You're so sexy. I think what you do is so creative.'"

Taylor excuse to Brittany was that he was out with Gaga at 3am because "they were at the Chateau Marmont with a group of people."

An eye witness told the publication that Gaga and Taylor were at the Sneak Joint in San Diego on September 4 and did not care who saw them being affectionate.

"She and Taylor were flirting all night and kept smacking each other's butts," the insider said. "She was grinning from ear to ear."

Taylor has appeared in television shows; The Vampire Diaries, CSI and Bones. (C) Cover Media