And although this isn't the case with all of Hollywood, there are a few we like to call Celebrity Serial Daters.
Her spouse of Good Charlotte fame wore a black top and jeans with sneakers and a big watch.
Diaz had been scheduled to leave Las Vegas on Sunday with her friends, sources tell PEOPLE, but decided to extend her stay through Tuesday.
Diaz has been linked with actors Djimon Hounsou and Tyrese Gibson since her high profile breakup with Justin Timberlake.
The two have stayed very far under the radar since saying I do at her estate in early January 2015.
In Hollywood, the dating circle seems to be so small that most celebrities share boyfriends and girlfriends and swap spit left and right.