But it was not always so for Michelle Obama, who as a child was so foul-mouthed she lost out on an award at summer camp aged 10, according to a new biography.
The first lady-to-be was an avid attendee at a day camp on the shores of Lake Michigan, and stood out as the most capable in her age group.
But camp leaders were so taken aback by her salty tongue that they denied her a prestigious award when the camp ended, according to biographer Peter Slevin, whose Michelle Obama: A Life was previewed by People magazine.
Michelle Robinson, as she was then known, as so stunned by the revelation that she changed her ways immediately and put an end to her 'cursing phase'.
The anecdote surfaced in the upcoming book on Mrs Obama, which also includes the revelation that her mother was anxious about her marriage to future president Barack Obama – because he is mixed race rather than completely black.
Slevin quotes her as saying: 'I was going through my cursing stage.'
'I didn't realize until my camp counselor at the end came up and said: "You know, you would have been best camper in your age group, but you curse so much".'
'And I thought I was being cool.'
Mrs. Obama used to attend the camp regularly with her brother, Craig. She would have been ten years old at the camp held in 1974, while Craig would have been 11.