She said it was "probably the best thing I've done so far in the White House."

Was First Lady talking about meeting the Queen of England? Planting a garden on the White House lawn? Having Beyonce sing to her and her husband on Inauguration night?

Nope. She was talking about her visit to Sesame Street earlier this week.

She went to tape a public service announcement with Elmo. The PSA, part of Sesame Street's Healthy Habits for Life effort, promotes exercise and healthy eating habits for children and encourages parents to be healthy-living role models.

Obama joins Barbara Bush and Hillary Clinton on the guest list of former U.S first ladies who have visited Sesame Street. She and Elmo played quite well together. See it here.