07/08/2014 at 03:00 PM EDT
A night out with pals never goes without a little relationship talk.
was spotted dining in Miami at the new South Beach restaurant Porfirio's Monday night with four pals, enjoying spicy Mexican fare and sipping on Mezcal drinks, a source tells PEOPLE.
The Sex Tape
star, 41, was in good spirits, gushing about her new relationship with rocker boyfriend Benji Madden
, 35, who was not with the group.
This outing follows an Independence Day trip to Anna Maria Island near Bradenton, Florida, where Diaz's family has a home. Madden and Diaz were seen running in and out of the water, holding hands and embracing under the tropical sun.
Diaz wore a teeny-weeny aqua bikini, showing off her rock-solid abs and perfectly fit legs.
The couple were also spotted shopping at Whole Foods.
, with Jason Segel
, opens in theaters on July 18.
Reporting by LINDA MARX