The 27-year-old actress came on to promote the new season of Girls while Max, 33, talked about the upcoming Veronica Mars movie and promoted his show New Girl.
“Had a great time in the @LateShow tonight,” Max wrote on his Twitter account. “Tune in!”
Check out clips of both of their interviews below!
Lena Dunham – ‘Late Show with David Letterman’ Interview
10+ pictures inside of Lena Dunham and Max Greenfield at the Ed Sullivan Theater… More Here! »