Obama explains lipstick on collar

Call it the case of the admiring aunt.

President Obama showed up at a White House event Tuesday evening with lipstick on his collar -- so he felt the need to make a public defense.

"I have to say I think I know the culprit," Obama said at a very friendly reception for Asian-American and Pacific Islander Heritage Month. "Where is Jessica Sanchez?"

He quickly added, "it wasn't Jessica -- it was her aunt ... Where is she? ... Auntie! right there!

"Look at this!" Obama said, pointing to the tell-tale lipstick on her collar. "Look at this!"

The president then went to the real reason for his testimony: "I just want everybody to witness -- I do not want to be in trouble with Michelle. That's why I'm calling you out right in front of everybody."

Obama calls out lipstick-on-collar culprit

President Obama jokingly calls out the culprit behind the lipstick mark on his collar.

VPC