By Cassie Carpenter and Kimberley Dadds
She split up with actor Justin Long last year.
But relationships obviously suit Leighton Meester as she has been looking increasingly smitten with her new boyfriend Aaron Himelstein as they continue to flaunt their love on holiday in Brazil.
The Gossip Girl star showed off her incredibly pert derriere as she frolicked in the sea with her beau over the weekend.
Beach babe: The Gossip Girl star looked happy and care free as she frolicked around on the beach in Rio De Janeiro during her romantic holiday
New couple: The pair briefly dated back in 2007 but they have obviously reunited if these shots are anything to go by
Loved up: And one person who was appreciating her stunning looks was her new boyfriend Aaron Himelstein, who kissed and cuddled her in the sea
She showed off her tiny frame in the tiny swimsuit and as she paddled in the waves her curves were shown off for all to see as the bikini bottom was pulled up to reveal her bum cheeks.
Leighton, who turned 26 last week, showed off her fun side as she played around in the water with Aaron, who she previously dated briefly in 2007.
Holding on tight: The stars put on a public display of affection as they enjoyed their afternoon in the waves
Pert derriere: Leighton Meester showed off her perfectly toned curves as she revealed her bum cheeks in tiny bikini during Brazilian getaway
They then tried to catch some waves, which caused a girly Leighton to giggle as she fell over onto the sea floor, while Aaron dunked her under.
The pair also held hands as they appeared to not have a care in the world as onlookers saw their show of unity.
Catching waves: They didn't have a care in the world as they enjoyed spending time together while catching rays
Playful pair: They've spent the last few days showing off their romance in the Brazilian city
The pretty brunette also took some time out during her holiday over the weekend to greet her fans.
She was approached by a number of admirers outside of her hotel on the previous day.
Revealing: The actress, who turned 26 last week, appeared body confident as she ran around in her pink two-piece
Splashing around: The pair bonded as they fooled around with each other in their beach get-ups
She looked care free as she stepped out without her glamorous garbs in just some denim shorts and a pink Ralph Lauren shirt and flip-flops.
The couple continued their romantic Rio getaway as they visited the hippie fair in Ipanema and The Candeleria Church in the country.
Fan favourite: She signed autographs and posed for photos with fans outside of their Rio hotel as she appeared bare faced