JOHNNY DEPP is getting cold feet about tying the knot with Amber Heard, sources tell The ENQUIRER.

The 51-year-old “Pirates of the Caribbean” star’s two kids don’t want the bisexual beauty as their stepmom, insiders say, and he’s terrified that Amber, 28, will dump him for a younger guy!

Johnny hit the panic button after Amber got cozy with Hollywood hunk James Franco, 36, on the set of “The Adderall Diaries.”

“There’s a real spark between Amber and James, and Johnny was jealous as hell when he saw pictures of them cuddling and giggling,” said a longtime friend.

“Although Amber insisted they were getting in character, Johnny’s not so sure, especially with James’ reputation as a skirt-chaser.”

The couple had planned to wed in Los Angeles this fall, sources say. “But now he’s suggesting they push the wedding back until the middle of next year, at the earliest,” the pal said.

“Johnny wants his kids to be front and center when he and Amber tie the knot, but it seems they just can’t warm to her.

“Lily-Rose and Jack are very close to their mother (Vanessa Paradis) and they blame Amber for wrecking their family.

“Vanessa has even told Johnny that Lily-Rose said she wouldn’t feel comfortable as a bridesmaid.

“Amber also wants a baby, and Johnny keeps thinking about being 70 by the time their kid goes to college. Then Johnny sees Amber with guys her own age and wonders if he’s doing the right thing.”

If the two don’t make it to the altar, Amber would be Johnny’s fourth jilted fiancée, joining
actresses Winona Ryder, Jennifer Grey and Sherilyn Fenn.

Added the source: “Amber’s not happy about having to wait to take the plunge – and it could spell doom for their relationship!”