Charli xcx Shows Off in Skimpy Bikini During Lakeside Getaway

Charli xcx is giving fans a very cheeky look at her lakeside getaway ... posing solo in a skimpy bikini.

The "Brat" singer kicked things off facing the camera in the teeny two-piece and bright pink heels ... striking a pose with her hands in her hair.

Then Charli turned around -- making sure the bikini looked just as good from behind.

She finished the photo dump perched by an open window overlooking the lake ... serving up quite the view herself.