"Single Ladies" singer Beyoncé took to her Instagram account Thursday. "If you like it you should be able to put a ring on it #WeWillUnite4MarriageEquality."
On Wednesday, President Barack Obama tweeted a picture with the caption, "If you're willing to reach up and close that gap between what America is and what America should be, I want you to know that I will be right there with you."
Other celebrities voicing their support of marriage equality via social media include Madonna, "Modern Family" star Jesse Tyler Ferguson, "Argo" director Ben Affleck and comedian Seth McFarlane.
The Supreme Court review of California's Prop 8 and the Defense of Marriage Act has a number of A-list celebrities lending their support to the marriage equality issue.