Benzema fired pass the Villarreal's goalkeeper Sergio Asenjo before adding a second from the penalty spot.
Vicente Iborra gave Villarreal some ray of hope after pulling one back, but Real Madrid were able to hold on, seeing out the game as the club wrapped up their 34th league title.
Zidane's side who have won all 10 of their games since the league restarted in June head into the final game with a seven-point lead over second-placed Barcelona.
The Real Madrid boss says winning his first league title in three years feels better than winning the Champions League.
"This is better than anything. It takes a tremendous effort to win the LaLiga. After 38 matches, you have more points than anyone else."
On the other hand, Lionel Messi isn't happy with the way Barcelona surrendered the league to Real Madrid. Barcelona were leading the table before the league went on a three-month break in March.
Messi scored Barcelona's only goal in their game with Osasuna but it was not enough to ensure that they win the game as they went on to loss 1-2.
After the game, Messi was frustrated with how the club as fared all through the season.
"All season we have been a very weak team, beaten for intensity, for motivation, people can score against us very easy, we lost many points where we shouldn't lose them. This game has just summed up how our season has been."
Do you think Lionel will leave Barcelona?
Content created and supplied by: Vickybliz (via Opera News )
Opera News is a free to use platform and the views and opinions expressed herein are solely those of the author and do not represent, reflect or express the views of Opera News. Any/all written content and images displayed are provided by the blogger/author, appear herein as submitted by the blogger/author and are unedited by Opera News. Opera News does not consent to nor does it condone the posting of any content that violates the rights (including the copyrights) of any third party, nor content that may malign, inter alia, any religion, ethnic group, organization, gender, company, or individual. Opera News furthermore does not condone the use of our platform for the purposes encouraging/endorsing hate speech, violation of human rights and/or utterances of a defamatory nature. If the content contained herein violates any of your rights, including those of copyright, and/or violates any the above mentioned factors, you are requested to immediately notify us using via the following email address operanews-external(at)opera.com and/or report the article using the available reporting functionality built into our Platform See More