Hilary Duff: Always Coca-Cola...

Hilary Duff clutches onto her iPhone as she downs a bottle of diet Coca-Cola in Los Angeles on Friday (July 24).

Earlier this month, the 21-year-old singer/actress and boyfriend Mike Comrie celebrated a friend’s birthday at Lavo Italian Restaurant inside Las Vegas’s Palazzo Resort and Casino. The group downed eight bottles of Cristal champagne! The next day, the couple hung at a poolside cabana at Tao Beach.