Affleck later responded in a terse tweet, writing, "I acted inappropriately toward Ms. Burton and I sincerely apologize."
On Wednesday, makeup artist Annamarie Tendler claimed that Affleck groped her during a 2014 Golden Globes party.
"I would also love to get an apology from Ben Affleck who grabbed my a** at a Golden Globes party in 2014," Tendler alleged in a series of tweets. "He walked by me, cupped my butt and pressed his finger into my crack."
"I guess he tried to play it like he was politely moving me out of the way and oops touched my butt instead of my lower back?" she continued. "Like most women in these situations I didn't say anything but I have thought a lot about what I'd say if I ever saw him again."
On Wednesday, a source close to Affleck told ET, "Ben has done things in the past in jest that could be seen as over the top or inappropriate, but he would never intentionally hurt or harass anyone."