As Woods stepped to the tee box at No. 17, Williams raised her phone to prepare to take a photo.
A tournament official noticed and immediately walked toward her, waved his arm to get her attention and then let her know that taking photos was not allowed.
Williams tweeted about the mishap: "Apparently u can't take pictures of golfers. In my Defense peeps always take pics of tennis players."
Sorry, Serena, that's a no-no on the links.
Sure, taking a photo with a camera phone is a lot quieter than snapping frame after frame with a big, professional-caliber camera. But it's still not allowed.