Do you know who Lamar's biggest fan is? See how well you know the 'Good Kid' rapper.
Watch what went down when the comedian and rapper went head to head.
Kendrick Lamar got an up close and personal view of comedian Kevin Hart's alter-ego Chocolate Droppa in London recently.
The videos shows Kevin challenging Kendrick to a freestyle, which involved the comedian essentially leaving the rapper speechless for two minutes.
Kendrick Lamar recently unveiled his new song 'i' , which is the first single to be taken from his much-anticipated new album.
(Warning: this video contains strong language that some people may find offensive.)