Robert Downey Jr., Reese Witherspoon, Justin Timberlake and Others Tweet About Memorial Day

— -- Stars are taking to social media to pay tribute to the military on Memorial Day.

From Justin Timberlake to Courteney Cox, stars are thanking the troops for their service and honoring those who have died.

"Happy Memorial Day!" Robert Downey Jr. wrote on Twitter. "Eat, laugh, & remember those who sacrificed their lives for you to be able to do those things."

Added Reese Witherspoon: "To all brave souls who risked their lives for our country - today, we honor you. #MemorialDay."

For more thoughts from some of your favorite stars, see the list below.