First recorded (as “Something Stupid”) by Carson and Gaile (1966).
Hit versions by Frank Sinatra & Nancy Sinatra (US #1/MOR #1/UK #1 1967), Robbie Williams & Nicole Kidman (UK #1 2001).
From the wiki: “‘Somethin’ Stupid’ is a song written by C. Carson Parks and originally recorded in 1966 by Parks and his wife Gaile Foote, as ‘Carson and Gaile’. In the early 1960s, Carson Parks was a folk singer in Los Angeles. He was an occasional member of The Easy Riders (‘Marianne‘. ‘Memories Are Made of This‘) and also performed with The Steeltown Three.
“In 1963 Parks formed the Greenwood County Singers, later known as The Greenwoods, who had two minor hits and included singer Gaile Foote. Before the Greenwoods disbanded, Parks and Foote married and, as ‘Carson and Gaile’, recorded an album for Kapp Records, San Antonio Rose, which included the track ‘Something Stupid’. The recording was then brought to the attention of Frank Sinatra by Carson’s younger brother, then-session pianist Van Dyke Parks, who had also performed with The Steeltown Three.