Vocal: Sonny Schuyler.
Bing Crosby [with Lani McIntyre & his Hawaiians; B-side of Sweet Leilani and in film Waikiki Wedding; Elvis was 2]
Richard Himber & his Ritz-Carlton Orch. [probably the same day as Bing (for Victor)]
Elvis Presley [in film Blue Hawaii and in '73 during satellite transmitted Aloha From Hawaii show; clearly inspired by Bing Crosby's vocal style]
Willie Nelson [in film Honeymoon In Vegas]
Leo Robin also wrote Diamonds Are A Girl's Best Friend.