Selena Gomez's Transplant Scars Visible As She Soaks Up Sun in Sydney

Selena Gomez put on a bikini and hopped on a boat in Sydney Harbor over the weekend, and you can clearly see some of the scarring from her kidney transplant.

Gomez soaked up the sun Sunday with some friends -- none of whom were Justin Bieber.

The scar is not located near the kidney, but Selena had complications immediately after her transplant. An artery broke and she had to get emergency surgery where doctors took a vein from her leg and created a new artery to help stabilize the overactive kidney -- hence the big scar on the inside of her right thigh.