The internet’s favorite girl is bringing the heat. While promoting her beauty brand, Rhode, on Friday, Hailey Bieber showed off her toned backside while rocking a brown thong bikini. In one Instagram shot , the entrepreneur, 29, who sported yellow heels, gave fans a look at her tanned and muscular body while facing away from the camera.  Hailey Bieber flaunted her toned backside while in a brown thong bikini on Friday (as pictured here). Instagram/@rhode The entrepreneur, who was promoting her beauty brand Rhode, also showed off her ripped abs. Instagram/@rhode Another snap had the model flaunting her abs as she rested a Rhode product in the middle of her bikini top. Hours later, Bieber took to her Instagram Story to post a close-up photo of a workout band right beneath her backside. The influencer’s post comes on the heels of her shutting down rumors that she’s had any cosmetic surgeries — including a Brazilian Butt Lift.…