Johnny Depp and Amber Heard
Johnny Depp may delay his marriage with Amber HeardReuters

There's trouble in paradise for Johnny Depp and fiancee Amber Heard.

A new report claims that the Pirates of the Caribbean Star may delay their marriage plans, as their relationship is in turmoil.

The couple who got engaged sometime back had plans to marry in the summer of 2015.

Almost a year after their whirlwind romance and surprise engagement, the couple have now slowed down, reported People Magazine.

"Johnny is crazy in love with Amber, but there is turmoil in the relationship," a source told the magazine, noting that the age gap is part of the problem.

The 51-year-old actor also had trouble with Heard's flirtatious ways.

"Amber flirts and has many different relationships. She is not really ready to settle down," the source added.

The source also revealed, "Johnny wants to make it work but may hold off on marriage for now. While he is crazy about her, she is a real challenge for him."

Depp recently raised eyebrows with a rambling appearance at the Hollywood Film Awards last month, which didn't go well with his fiancee.

Amber Heard is reportedly upset with Johnny Depp after his drunken speech at the 18th Annual Hollywood Film Festival.

According to Star magazine, the 28-year-old Drive Angry star "couldn't believe he had made such a fool out of himself".

"This reflects really badly on her, and she's not happy about it. There's a chatter in Johnny's camp about rehab. At this point he is driving everyone away – including Amber," an insider said.

Depp and Heard who met on the sets of their 2011 movie The Rum Diary, went public with their relationship the following year after The Pirates of The Carribean star announced his split from Vanessa Paradis.