I didn't know they'd split up either. Apparently he wooed her back with flowers and "handwritten poems" as opposed to the typed kind that wouldn't be worth nearly as much money.
The 49-year-old actor - who confirmed his split from Vanessa Paradis after 14 years together in June - enjoyed a brief romance with the 26-year-old actress in the summer after meeting her on the set of their film The Rum Diary.
However, Amber then ended their dating arrangement after deciding she wanted to be single. Well, she is bisexual, that's double the temptation.
But Johnny decided not to give up on the blonde and sent her a personally penned poem and a bouquet of roses every day throughout September to convince her to give him another chance. While most people might find that a little unnerving, his plan eventually worked for him and she flew out to his private island, Little Hall's Pond Cay in the Bahamas (in case you want to drop by sometime), to reenact some of their Rum Diary beach house sex scenes.
A source told The Sun: "Although Amber and Johnny have electric chemistry, she felt that as they are both out of long-term relationships, they needed to be single for a while. Johnny didn't give up though - he missed her so much over the summer. They both love literature and the way he tried to win her back totally worked. Once they flew to his island in the Bahamas for a romantic break a couple of weeks ago, they were back on as a couple. Johnny's the type to fall hard and he's vowed not to let a girl like Amber, who's beautiful and intelligent, slip through his fingers."
Since returning from their romantic getaway, Johnny and Amber have been virtually inseparable and she has stayed at his Los Angeles mansion almost every night, although she has told the Hollywood heartthrob they shouldn't get too serious too quickly.
More mixed messages. No wonder he's smitten.