Demo recordings such as "Come On Baby" (written by Gibson and Lovejoy), "Eleventh Minute" (written by Gibson and Altfeld), "Just For Tonight", and "Baby What's It Gonna Be" were cut and produced by Berry for Liberty Records.
Gibson performed most of the leads on these unreleased demos.
Arriving in London, England, Gibson, Cass Elliot, John Phillips, Denny Doherty, and Lou Adler rented the top half of a large house in Berkeley Square to work in (the downstairs part was rented to Mick Jagger and model Chrissie Shrimpton).
While in England, the band had a series of business meetings, but still made time to party with John Lennon, Paul Mc Cartney, Keith Richards, Brian Jones, and Mick Jagger at Dolly's (the private London rock club that catered to the stars).
The single peaked at number 5 on the Billboard Hot 100 on July 30, 1966, The American record-buying public had already ordered more than half a million advance copies of this album before it came out, and it was said to have been the most eagerly awaited record of that year.
This was soon changed by their label Dunhill Records who asked the original photographer Guy Webster, to photograph Jill Gibson alone in exactly the same pose as Philips' had been in, and then to superimpose Gibson's image over Phillips'.
A promotional campaign to introduce Gibson as the newest Mama soon followed, with articles in such publications as Newsweek magazine, who did an article on the group where they referred to Gibson as "skeletal, modish, blonde and beautiful".
The new Mama also did several television show appearances with The Mamas & The Papas to promote their latest single, "I Saw Her Again".
Later Gibson dated Lou Adler, whom she had known since 1959 when he was the executive producer and manager of Jan Berry and Dean Torrence.
Adler had recently separated from his wife, actress and singer Shelley Fabares.
Other guests included Judy Lovejoy (her former singing partner), Dean Torrence, Don Altfeld (her former songwriting partner), Ann Marshall, Ryan O'Neal, Nancy Sinatra, Lou Adler, Lloyd Thaxton, Diane Rovell and Ginger Blake of The Honeys.