Singer Justin Bieber stopped by at a bar and grill outlet at the University of Southern California (USC) and bought drinks for a number of people.
She said: "I enjoy being terrible because it means I never have to get a computer. I don't have one. We have no social media in our home."
The campaign kicks off Tuesday to coincide with World AIDS Day, which is Dec. 1.
Trailblazing pop star Pink saw firsthand severely malnourished children during a recent visit to Haiti as a part of a UNICEF program to provide therapeutic food packets to children in need.
Confirming the news of her pregnancy, actress Anne Hathaway flaunted her baby bump in public for the first time while out on a shopping spree here.
The actor duo have children Maddox, 14, Pax, 11, Zahara, 10, Shiloh, nine, and seven-year-old twins Knox and Vivienne.