Beyonce might wanna watch her back, cause Serena Williams is channeling her inner Queen Bey -- and doing a pretty damn good job at it in a brand new video.

Serena --  the cover girl for April's issue of Vogue -- teamed up with the mag to take over the BallenIsles Country Club in Palm Beach for her own version of Beyonce's "7/11" music video.

We gotta say ... the results ain't half bad. Serena plays a little tennis, has a little fun, and even does a little twerking.

Clap, clap, clap, clap ...