United Kingdom, May 14 -- Julia Louis-Dreyfus felt "so awkward" kissing Stephen Colbert with their partners backstage.

The 65-year-old star made her final appearance on her friend's Late Show one week before it comes to an end, and she joked she wanted to join Colbert's lists of guests he's kissed over the years.

Earlier this week, the late night legend reveals he's smooched Sally Field, Helen Mirren, Allison Janney, Jeff Daniels and Andrew Garfield.

During Tuesday's (12.05.26) episode, Julia quipped: "No one's watching. It's just between us."

Reflecting on the skit the following day, she told The Hollywood Reporter: "Awkward. It was so awkward.

"As we started to do this bit, I thought, 'Oh no. Is this gonna work?' (Laughs) I get ver...