Lindsay Lohan's Got A Bikini Beach Bod

Lindsay Lohan and her younger brother Michael Lohan Jr. soak in the sun on Miami Beach on Wednesday (December 31).

No girlfriend Samanta Ronson in sight!

For New Year’s, Lindsay will make an appearance at Mansion nightclub in Miami while Samantha DJs. (Tickets: $200.)

Also near South Beach: John Legend will be at Prive (admission: $200), and T.I. will perform as Chloe Sevigny hosts a fete at Gansevoort South. (Tickets begin at $225.)

15+ pictures inside of bikini beach babe Lindsay Lohan…