Jessica Biel The Bootyful Bikini Bottom

6/25/2012 9:25 AM PDT

Jessica Biel -- The Bootyful Bikini Bottom

In case you forgot, Jessica Biel has the most ridiculously awesome ass on the planet -- and she reminded everyone while in Puerto Rico this weekend ... rocking the world's luckiest pair of bikini bottoms.

Reason #431 why Justin Timberlake's life is better than yours.