SERIAL supermodel dater Leonardo DiCaprio is at risk for getting caught in a dra­matic love triangle with Victoria’s Secret stunner Miranda Kerr and her actor husband Orlando Bloom.

Insiders say “Pirates of the Caribbean” star Orlando is deeply concerned that a “special friendship” has been brewing between Leo and Miranda while he’s in South Africa filming his upcoming flick, “Zulu.”

For weeks, The “Dhango” hunk and the gorgeous Australian model have raised eyebrows with their flirtatious-looking public displays around New York City – and insiders suspect Orlando has had enough!

“Leo and Orlando have been friends for a long time, and there have never been any trust issues between them – until now,” revealed a source. “Orlando knows that Leo goes through supermodels like Kleenex.

“Obviously, he won’t want to chance his wife being next on Leo’s hit list, so he’s probably doing everything he can to stop that from happening.”

Orlando and Miranda married in 2010 and have a 2-year-old son, Flynn. Meanwhile, Leo – who’s in New York filming “The Wolf of Wall Street” – has been on the prowl since his recent split from another Victoria’s Secret model, Erin Heatherton.

With her hubby overseas, Miranda partied late into the evening with Leo at his 38th birthday bash at Darby Downstairs on Nov. 10. Then, on Nov. 21, she and Leo were spotted laughing and seemingly flirting at the ABC Kitchen, where they dined with a small group of friends.

Less than a week later, they reunited at an exclusive, invitation-only party at nightspot Rosewood, where they spent the evening dancing and talking intimately as Miranda reportedly draped her legs across Leo. Still, pals insist the friendship is purely platonic.

“Even if it’s completely innocent, Orlando probably feels that Leo and Miranda’s behavior is disrespectful,” added the source.