The 27-year-old recently shot for the Slice campaign at an undisclosed location in Thailand where she not only performed some under water shots but also worked for more then 14 hours to finish the shoot.
"Katrina is a thorough professional and hard work doesn't scare her. The new Slice ad required her to shoot extensively under water and it is quite tiring. She wrapped up two days' work in a day and everyone was impressed with her comfort in water," said a source in a statement.