A source close to Taylor Swift recently revealed more information about the "game" between Taylor Swift and Katy Perry over Harry Styles.

"Katy had her hand on his arm and playing with her hair - she was being really obvious. Taylor thinks Katy orchestrated this whole thing just to mess with her. It makes her blood boil that Katy has this sweet-as-pie image when she is one of the most conniving girls in Hollywood," a source told Star magazine.

Taylor Swift allegedly contacted Harry Styles after being spotted going on a date with Katy Perry and told him to "watch out for Katy," a source told Heat magazine. 

"Harry didn't respond, but did tell Katy all about it," a source told the magazine.

"Katy would probably find it funny to think of Taylor, at home Google-stalking her and Harry. They'd [Harry and Katy] have thought it was pretty hysterical that Taylor took the bait and used their innocent dinner as an excuse to reach out to Harry."

One Direction singer Harry Styles is dating Katy Perry to get his ex-girlfriend Taylor Swift jealous, rumors on social media are suggesting.

Speculation over his new girlfriend began when a source revealed the new couple went on a date.  

"Katy and Harry had dinner together at Nobu in Malibu late Thursday night. Just the two of them," a source told Hollywood Life.

"They seemed happy, smiling and enjoying their dinner and conversation."

Hillary Duff revealed during a recent interview that she wants to collaborate on a duet with Harry Styles, leaving many fans wondering if his ex-girlfriend Taylor Swift is jealous.

"I might go with an unknown or an up-and-comer just to give the song even more of a quirky feel," Duff said during the MTV interview.

"But secretly, I really love Harry Styles, but he's kind of busy with One Direction - I know this - but I am a secret 1D fan."