Alicia Keys, Jamie Foxx and Mariah Carey lead tributes to Martin Luther King, Jr. on MLK Day

• Madonna, Salma Hayek, Kris Jenner and Matthew McConaughey were also among those to chime in 
• Kerry Washington and Viola Davis urged awareness toward the ongoing battle in the U.S. Senate over voting rights 
• King was 39 when he was assassinated in April of 1968 in Memphis, Tennessee 
• King would have turned 93 on Saturday 
• King made his 'I Have a Dream' speech against racism in the March on Washington in August of 1963 

Alicia Keys, Jamie Foxx and Mariah Carey were among a number of celebrities who took to social media Monday to pay tribute to the late Martin Luther King Jr. on MLK Day.

The stars took part in marking what would have been King's 93rd birthday Saturday, posting photos and quotations from the late civil rights icon.

Keys shared a quote from civil rights leader Valarie Kaur that read, 'Revolutionary love is the call of our time,' with shots of herself and husband Swizz Beatz (along with a shot of King and late wife Coretta Scott King) underscored to her song Love When You Call My Name.

Jamie Foxx thanked King for his service and inspiration with an image of the slain activist, while Mariah Carey shared a quote from King and an image from the March on Washington from August of 1963.

Madonna shared a shot of the late civil rights activist, saying he 'showed us that nothing is impossible if we believe,' while Kate Hudson urged her followers to listen to a speech from the late Nobel Peace Prize winner.

Actresses Salma Hayek, Bryce Dallas Howard, Jana Kramer, Lindsay Lohan and Vanessa Hudgens shared quotations from the American icon, while Kris Jenner, Tom Brady, Matthew McConaughey and Ellen DeGeneres did the same.

Some of the social media posts centered around the ongoing battle in the U.S. Senate over voting rights, with Kerry Washington and Viola Davis stressing the importance of the current day issues in preserving the massive legacy King set forth.

Martin Luther King, Jr.’s eldest son Martin Luther King III spoke in Washington, D.C. on Monday, urging President Joe Biden and Congress to move forward on legislation that would ease voting restrictions led by Republicans in at least 19 states. 

King said that 'our democracy stands on the brink of serious trouble without these bills.

'They told him he had to change hearts first,' he said. 'And he worked hard at that. After all, he was a Baptist preacher. But he knew that when someone is denying you your fundamental rights, conversation and optimism won’t get you very far.'

Biden echoed similar sentiments in a speech, saying that King's life work centered in part around 'the sacred right to vote, a right from which all other rights flow.'

The president continued: 'It’s time for every elected official in America to make it clear where they stand. It’s time for every American to stand up. Speak out, be heard. Where do you stand?'

King made his 'I Have a Dream' speech against racism in the March on Washington in August of 1963, winning the Nobel Peace Prize the following year.

King was 39 when he was assassinated in April of 1968 in Memphis, Tennessee during a strike on behalf of sanitation workers.