Lamar responded graciously, including the phrase "HUBLUV," which references Compton's "Hub City" nickname given for its central location within Los Angeles County.
To which Brown geeked out with emojis just a little bit.
Lamar also released a video promoting his new line of red and blue classic leather Reebok shoes with a message of unity between gangs on Thursday.
In it, rappers Jay Rock -- who's also signed to Lamar's label and management company Top Dawg Entertainment -- and Glasses Malone are brought together, crossing ganglions, to discuss the importance of harmony over hatred. Rock is a Bounty Hunter Blood and Malone is a Watts Crips, together bringing a powerful message while preaching to Lamar's significantly voice and the way he's chosen to use it.
Watch the video here: