The 24-year-old actress looked devilish in a figure-hugging, low-cut red dress while shooting scenes for The CW series' fourth season. The only problem? McCord inadvertently exposed her nipple tape on numerous occasions.
Later in the day, McCord -- currently dating Prison Break star Dominic Purcell, 41 -- changed into a more demure striped maxi-dress. While her chest was fully covered, the see-through fabric accidentally revealed her underwear.