I had seen this picture of Jayne Mansfield before, but it was cropped to show her alone. Maybe because an unamused Sophia Loren, Evil Eye ablaze (I hope I, or rather Google, got the translation right), detracted from her charms.
Doing a bit of research, I found it was taken in 1957, at the Romanoff restaurant in Beverly Hills. Apparently Mansfield was notorious for these publicity stunts. At left, another photo from the same encounter.