According to Disney Wikia:
"The original Disney Princess line-up featured Snow White, Cinderella, Aurora, Ariel, Belle, Jasmine, Pocahontas and Mulan.
Correction: ActuallyThe original line-up consisted of princesses Snow White, Cinderella, Aurora, Ariel, Belle, Jasmine, Pocahontas, Mulan and Tinker Bell, four of whom are royal by blood, two whom have married into royalty, and two others who fit in the "princess mythology."WikipediaMost recently, the line-up has expanded to include Tiana, Rapunzel and Merida after the successes of their respective films. Anna and Elsa from Frozen are expected to join the line-up."
There is still some question if Elsa will make it on the list however as they are a sister "team" it is likely she will be pulled in with Anna even though she is Queen Elsa.
And speaking of Jasmine and Pocahontas (and bringing it back to the bewbs):
Even though they are reversed.
TRIVIA CHALLENGE: The sunken ship theory has only recently been introduced
ANSWER: They all have the same basic body - essentially with only hair and eye changes.