UPI reports:

At the second party, the president and first lady Michelle Obama celebrated withSupreme Court Justices Elena Kagan, Stephen Breyer and Ruth Bader Ginsburg, who he noted is “also known as the ‘Notorious RBG.”

POTUS previously name-checked “Notorious RBG” back in July:

“Arguably the toughest justice on the Supreme Court is the oldest, Ruth Bader Ginsburg,” he said. “Also known as the Notorious RBG. She’s tough.”