Adele has topped the list of Amazon.com's best-selling albums of all time, Digital Spy said.

The star's 2011 album 21 leads the list after impressive digital and physical sales on the online retailer over the past three years.

Susan Boyle's debut I Dreamed A Dream is in second place, while the original Broadway cast's recording of Wicked is at three.

However, Lady Gaga's Born This Way leads the best-selling MP3 albums of all time list, after Amazon offered the set for just 99 cents during its first week on sale back in 2011.

Mumford & Sons place second with Sigh No More and The Lumineers are third with their self-titled collection.

Daft Punk's Random Access Memoires has been crowned the best selling CD on Amazon.com in 2013, while Tegan & Sara's Heartthrob topped the best-selling MP3 album of 2013.

Robin Thicke's 'Blurred Lines' has been named the best-selling MP3 track, while Katy Perry's 'Roar' finishes in second place.