Katy Perry has apparently got a "huge crush" on a member of One Direction… and we aren't talking about Niall Horan!

Despite sharing a smooch with the Irish heartthrob at the 2012 MTV VMAs, it seems K-Pez has now turned her attention to his bandmate, Harry Styles.

Perry - who has recently been linked to Diplo - reportedly 'cosied up' to Styles during a recent dinner date at Nobu in Malibu, with a source telling Look magazine: "They like each other.

"Katy and DJ Diplo are casually dating, but she's developed a huge crush on Harry, which she calls unexpected."

They continued: "He looks up to Katy and loves that she isn't your typical needy twenty-something."

[related]And, it seems Hazza's ex-girlfriend Taylor Swift is unimpressed by the news - especially as she's rumoured to be feuding with Perry.

Speaking of T-Swizzle's reaction, the insider noted: "She's shocked. Katy dating an ex? Yeah, that would hurt."

Take cover! We sense another celeb cat-fightbrewing…