Madonna's Big Apple Museum Visit

Surrounded by a large entourage of security guards, Madonna was spotted outside the Museum of Modern Art in New York City yesterday (May 23).

The "Material Girl" singer sported a super-sophisticated look, wearing a pair of glasses, a blue satin belted coat, black pants and a pair of peep-toe black pumps.

Earlier in the day, while making a surprise guest appearance on Oprah Winfrey's first farewell show, the 52-year-old paid tribute to the TV queen, lending these kind words, "She is a self-made woman who has been at the top of her game for over 25 years and she is still kicking ass. She fights for things she believes in even if it makes her unpopular. She has balls and a wealth of compassion. I have learned so much from her."

Madonna also praised the famed host for her quest in educating underprivileged girls, telling, "We both share a passion for educating girls in Africa and Oprah's commitment to building the girls academy in South Africa and seeing it through and having it be such a success against all odds has helped me to understand that it is possible and that in spite of the challenges I have encountered trying to build a girls school in Malawi that I should stay the course and keep going no matter how much resistance I encounter.'