Leighton Meester's perfectly "Pink Bikini" toned during Brazilian getaway

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.

Pert derriere: Leighton Meester showed off her perfectly toned curves as she revealed her bum cheeks in tiny bikini during Brazilian getaway

Revealing: The actress, who turned 26 last week, appeared body confident as she ran around in her pink two-piece

 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 looked the picture of health and happiness as she wore a tiny pink snakeskin bikini in Rio de Janeiro.

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

 

Just butt-iful: Leighton looked pretty and fresh as she showed off her perfect physique and curves

Pert derriere: Leighton Meester showed off her perfectly toned curves as she revealed her bum cheeks in tiny bikini during Brazilian getaway

The pair looked loved up as they put on a public display of affection and kissed and cuddled in the water.

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

And the relationship seems to be doing wonders for Meester as she has become so care free she has even started to step out without make-up on.

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

Leighton was completely barefaced as she happily posed for photos with her eager fans and signed autographs for them.

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.