The 28-year-old actress, who recently celebrated her 28th birthday, shows her bikini body in some pictures taken during her vacation, reported Ace Showbiz.
"Thank you everyone for all the birthday wishes," she captioned the picture.
Another photo features the former Nickelodeon star relaxing poolside while wearing the same two-piece. "Spring break," she wrote.
Bynes has been in Mexico with her parents, Rick and Lynn Bynes. The 'Easy A' actress, who had a rough 2013 and completed her rehab stint late last year, looks much healthier and happier now.