No love for Ms. Bouvier Kennedy Onassis?

Not unless your a necrophiliac.

Or Babs Bush?

Dolly Madison sounds pretty hot. And there's always Eleanor and the girls.

I was thinking that the honor would go to Abigail Adams. And if not her then Frances Cleveland.

Mary Todd was kinda hot in a sightly offbeat sorta way.

If by "offbeat" you mean "whack job".

Unfortunately paintings are hard to use for judgment (so Dolley and Abigail are difficult to know), but I'm serious about Frances Cleveland being a candidate: