Obama was kissed by an attendee at the Asian Americans and Pacific Islanders (AAPI) Heritage Month Celebration, and took a moment to address the mark on his white shirt.
"I want to thank everybody who’s here — the incredible warmth of the reception. A sign of the warmth is the lipstick on my collar,” Obama said to laughter.
After he made sure everybody knew the "culprit," Obama went on to praise the "incredibly rich heritage and contributions of Asian Americans and Pacific Islanders."
"There’s no better example of that diversity than the people who are in this room. We've got members of Congress; we've got members of my administration; we've got lots of special guests and talented performers," he continued.
The president honored artists, Karsh Kale, Paula Fuga, John Cruz, and Amy Tan, as well as lawmakers, including the late Sen. Daniel Inouye (D-Hawaii), the first Japanese American to serve in Congress, and Rep. Tammy Duckworth (D-Ill.), one of the first female veterans elected to Congress.
Obama also gave a special shout out to Sri Srinivasan, who was confirmed last week to be a judge on the U.S. Court of Appeals for the District of Columbia Circuit.
"I was proud to nominate Sri, and he was just confirmed unanimously to become the first South Asian American federal appeals court judge. I was telling his kids, who are here today, if he starts getting a big head, walking around the house with a robe asking them to call him 'your honor,' then they should talk to me," he said.