Puzzle #1611 - Buick Triplets Electra, Invicta and LeSabre, and a Cadillac

[Otto Puzzell]

Do you know who these girls are?

Please, respond below and identify who they are, and the story behind this picture.
As always, detailed answers are greatly appreciated by all. 
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Thanks!

[Ray B.]

http://www.dailymotion.com/video/xh3zl_frank-zappa-stinkfoot-tv-1974_music

[Otto Puzzell]

Nope. No Paul McCartney connection of which I'm aware, either. 

[Otto Puzzell]

Expert Point on the way...

[CyCarConsulting]

The Lennon sisters

[Otto Puzzell]

No

[Oguerrerob]

The Kane Triplets in front of a Cadillac Biarritz 1959

[Otto Puzzell]

That's not the information I have.

[Otto Puzzell]

Does a Pro know?

[neilshouse]

Are they the same triplets as these?

[Otto Puzzell]

The names are the same, so I'll assume yes.

[guido66]

The Schultz Triplets

[Otto Puzzell]

OK - so what's with the Cadillac?

[guido66]

Did the Cadillac stink? The girls are holding their noses 

[Otto Puzzell]

That's it. The three were hired by Buick to promote their three car lines (Le Sabre, Invicta and Electra) for 1959. At the Detroit Auto Show, they were snapped making their opinions known about the Cadillac division's Series 62. A funny impromptu staging, I'm sure GM never sanctioned this one. A point for neilshouse for identifying the triplets (by their stage names), and a point to guido66 for answering the second half of the question posed. Was the answer right under your noses? Well, sure - sometimes these puzzles are as simple as they seem.

[Otto Puzzell]

Another pic with the girls.