Gabrielle Union at Beach in Miami on Memorial Day

Spending a relaxing day on the beach, Gabrielle Union and her friend Savannah Brinson caught some rays in Miami this afternoon (May 28, 2012).

The 39-year-old showed off her rocking physique in a tiny white bikini that she paired with a cowboy hat and tweeted earlier today sharing, “Some military members fight a mental, emotional, financial, spiritual war when they return home, let's take care of our troops!”

Miss Union may be soaking up the sun, but she recently told People that she does not mess around with her SPF protection saying, ““I don’t tan on purpose, but I do a lot of beach workouts. But I go SPF 110.” The actress is working with Neutrogena to promote its healthy skin campaign and fight against skin cancer.