"I'm Lovin' It" is a song recorded by American singer-songwriter Justin Timberlake. The song was produced by The Neptunes and is credited as being written by Pharrell Williams, Tom Batoy, Andreas Forberger and Franco Tortora.

Answer this question based on the passage: who has sung the mcdonald's jingle i am loving it? Okie... think carefully first, then make a decision:
The relevant information is: "I'm Lovin' It" is a song recorded by American singer-songwriter Justin Timberlake. So, the answer is American singer - songwriter Justin Timberlake.