PIRATES of the Caribbean” star Johnny Depp’s planned summer wedding to his much younger “Rum Diary” co-star Amber Heard is about to capsize.

Sources say that’s because the actor’s baby mama, French beauty Vanessa Paradis, is trying to drive him crazy. She not only flaunted her fabulous figure during a sexy modeling shoot in Malibu to show Johnny what he’s missing, but also picked up a new beau, singer Benjamin Biolay, to make her ex super-jealous, add the sources.

Vanessa, who was with Johnny for 14 years and gave him two children – Lily-Rose, 14, and Jack, 12 – is in great shape and looks far younger than her 41 years.

“Believe me, Johnny took notice when he saw the glamour shots of Vanessa,” revealed a source. “He started seeing her in a whole different light…and that’s exactly the effect that Vanessa wanted to have!”

Meanwhile, Johnny, who broke up with Vanessa in June 2012, recently admitted: “I love her and she loves me.”

The actor’s pals are also throwing up roadblocks to the wedding – convinced the age gap between Depp, 50, and Amber, 28, will eventually sink the marriage. Adding to the trouble, bisexual Amber still seems torn between Johnny and her ex-flame, 38-year-old photographer Tasya van Ree. In fact, on the day before her and Johnny’s lavish engagement party, she was photographed in a car looking extremely distressed.

“Amber truly loves Johnny, but she’s getting the jitters,” said an insider.

“The whole thing may be unraveling before they can head down the aisle!”