While the president didn't wear a costume, Dr. Biden dressed as the couple's beloved cat, Willow Virginia Chamlee is a Politics Writer at PEOPLE. She has been working at PEOPLE for three years.

Jared Leto Dresses in Full-Body Cat Costume as Karl Lagerfeld’s Pet Choupette ... “What [Lagerfeld] liked was that people talked about Choupette. It made him so happy,” Caçote recalled ...