Blake Lively's 'Oakland booty' post riles social media

Lively posted side-by-side front and back shots of herself on the red carpet in Cannes, France, with the caption, "L.A. face with an Oakland booty," a line from rapper Sir Mix-A-Lot's 1992 hit, "Baby Got Back."

People magazine reported last month that the 28-year-old Lively is expecting her second child with husband, actor Ryan Reynolds.