"My older sister is not only smart, but also pretty."

Translation: 我的姐姐不但聪明，而且漂亮。

[RMayall]

It should be accepted without the 的

[walty]

This is especially the case with family members. Using 的 actually would be considered too formal.

[Mtyx.]

i think ..."而且很漂亮" should also be correct. Youdao dictionary lists many examples with 很 between 而且 and 漂亮。

[Chris349250]

Shouldn't it be acceptable for 不但 to be at the front of the sentence?