Princess Albertina is a female genital piercing, where a ring enters the urethra and exits through the top of the vagina.

[1][2] Anne Greenblatt described the Princess Albertina to Ralph H. in 1995 as a "relatively new and experimental piercing.

This piercing requires the bearer to have a large enough urethra for it to be viable.

It is an advanced piercing and many piercers may not be willing or able to perform it, largely due to the aforementioned concern about UTIs.

While many male genital piercings are transurethral, the longer length of the male urethra reduces the risk of urinary tract infection due to transurethral piercings.