The California-based Internet giant posted a text ad above the rude photo that ended up as the number-one result for Mrs Obama on its site.
The ad reads, "Sometimes our search results can be offensive. We agree.", reports the Daily Express.
Netizens clicking on the ad are taken to a letter from the company that says its results "can include disturbing content, even from innocuous queries", and adds that Google does not endorse content on these websites.
The company wrote, "We apologise if you've had an upsetting experience using Google."