Sylvester Stallone: Taken to Selfie School by Knockout Daughters

Sylvester Stallone is learning a valuable lesson about showbiz -- courtesy of his 3 daughters -- which is ... you gotta know how to shoot a selfie, dad!

69-year-old Sly took Sistine Rose, Sophia Rose and Scarlet Rose to Staples Center Thursday night for a Lakers game. Instead of watching the game, Rocky used his famous mitts to snap a few shots with the girls -- and then they took their own.

They weren't missing anything on the court -- Lakers lost by 20.