01/15/2014 at 03:45 PM EST
Tuesday, and she's already using it to spread some sisterly love.
Jessica, 33, posted a snuggly snapshot
with sister Ashlee Simpson
, 29, and her fiancé Evan Ross on Wednesday.
"Family moment," she captioned the picture, which shows Ashlee's one-of-a-kind engagement ring
, a five-carat sparkler custom-designed by jeweler Neil Lane.
Ross, 25, popped the question
while the two vacationed in Hawaii, sharing the news with his own celebratory Instagram
. From Jessica's photo, it seems Diana Ross's son has earned the Simpson family's approval.
It's unclear which sister will take their second trip down the aisle first – both Simpsons were also previously married, Jessica to Nick Lachey
and Ashlee to rocker Pete Wentz
, the father of her 5-year-old son, Bronx Mowgli.