Depp: Amber is a wonderful girl
The Pirates Of The Caribbean star is set to wed the 27-year-old actress, who he has been dating since 2012, but tends to keep quiet about his love life.
However, Us Weekly reported that he broke his silence during an interview with the Today show, saying of Amber: "She's a wonderful girl."
The 50-year-old went on: "She's sharp as a tack. A southern belle and sweet as can be, and very good for me."
Johnny and Amber met on the set of their 2011 film The Rum Diary and started dating the following year. It is thought the Hollywood star popped the question on Christmas Eve.
The actress has been snapped sporting a huge engagement ring and earlier this month Johnny showed off a diamond ring of his own during a trip to China.
Asked whether he was engaged, he replied: "The fact that I'm wearing a chick's ring on my finger is probably a dead giveaway. Not very subtle."
He laughed as he lifted up his left hand and displayed a single diamond on a band around his ring finger.
In 2012, Johnny split with his partner of 14 years, French model-singer Vanessa Paradis. They have two children.