A run of chart singles followed, including two 1966 top 10 hits, "How Does That Grab You, Darlin'?" (U.S. No. 7) and "Sugar Town" (U.S. No. 5). "Sugar Town" became Sinatra's second million-seller. The ballad "Somethin' Stupid"—a duet with her father—hit No. 1 in the U.S. and the U.K. in April 1967 and spent nine weeks at the top of Billboard's easy listening chart. Frank and Nancy became the only father-daughter duo to top the Hot 100, but DJs dubbed the track "the incest song" because it was sung as if by two lovers. The record earned a Grammy Award nomination for Record of the Year and remains the only father-daughter duet to hit No. 1 in the U.S.; it became Nancy's third million-selling disc.