In English, the proper title of a married lady is Mrs., the title of respect would be Madam, or Mam.
"Madam" is a palindrome that can be used as a title of respect for a lady. It reads the same forwards and backwards.
Mrs, means that the lady is a married woman.
Married Italian women are referred to as signora (like the English Mrs.); unmarried women are referred to as signorina (Miss).
The Hindu title of respect is "Shri" for men and "Shrimati" for women.
The Indian title of respect is "Shri" for men and "Shrimati" for women.
Lady Gaga is not married and has never been.
An eastern title of respect is Sri. This is the equivalent of "Mr." in the English language.
Lady Gaga isn't married and never has been married.
Usually they have the title Lord or Lady. However, if the father is multi-titled, they may adopt another title based on secondary titles.
lady is not a noble title so no, sadly Princess Diana of whales was not of noble blood. she married into nobility thus holding the title of Diana princess of whales.
The title of a woman married to a knight was Lady. The title of a woman who was herself a knight was usually Dame, though some English orders of knighthood, such as the Order of the Garter, styled their female members Lady. Please see the link to a related question below, "Could women be knights in the medieval times?"
Lady Gaga is not married right now.