The Los Angeles natives, along with hip-hop producer DJ Mustard, joined activists who took to the streets of Hollywood as part of the Millions March Protest, demonstrating against the recent grand jury rulings which cleared police officers over the death of two African-American men, Michael Brown and Eric Garner, in separate incidents.
Various photographs and videos of the music stars in the crowd were posted on social media showing them wearing T-shirts emblazoned with the slogans "Are ((We)) Next?" and "Black Lives Matter".
According to the Los Angeles Times, the demonstration was peaceful.
The West Coast version of the Millions March comes weeks after a similar event in New York City. Hip-hop mogul Russell Simmons and rapper Nas were among the celebrities who joined 30,000 protesters in the crowd marching through the streets of the Big Apple.