Depp, 51, purchased a red 458 Spider sports car for Heard, 28, reported Daily Star.
"Amber wanted the sexiest car available and she's over the moon with her new motor. Johnny's so generous and is always treating her," a source said.
Depp has been dating Heard since 2012 after the pair met on the set of the film 'The Rum Diary'. The couple became engaged on Christmas Eve in 2013.