Joely and Tricia took to Instagram on Wednesday with a joint statement, "In response to all of you asking whether or not we will be part of the celebration ... Strangely we won’t be in attendance to celebrate our sister, whom we adored."

They continued, "For some bizarre, misguided reason our niece has chosen not to include us in this epic moment in our sister’s career. This is something Carrie would have definitely wanted her siblings to be present for. The fact that her only brother and two sisters were intentionally and deliberately excluded is deeply shocking. We have all been grieving the loss of our favorite human for some years now…we have given Billie the space to do that in her own way. We have been nothing but loving and open, consistently."

They ended the post by saying ... "This isn’t about a photo op on Hollywood Blvd…this is about celebrating the permanency of Carrie’s legacy in this industry, taking her place with a star on the iconic Walk of Fame alongside our parents. We thank the Hollywood Chamber of Commerce for honoring our sister in this way. May the Fourth Be with you Joely and Tricia Leigh Fisher".

As we reported, Carrie's only brother Todd Fisher -- son of late singer Eddie Fisher and Late actress Debbie Reynolds -- told us he was heartbroken he was intentionally omitted from attending the ceremony... adding he was the one who got the ball rolling for Carrie to get her star.

Todd says Disney told him Carrie's family was in charge of the final guest list, and they had filled all the 30 seats given ... adding he was told not to stress Billie Lourd over the whole ordeal.