A source tells us that the young pair are planning a very eclectic Bohemian theme, similar to the decor of their engagement party, for their Labor Day nuptials. The Aug. 31 celebration will be held at Diana Ross estate in Greenwich, Conn., during the evening, with white lanterns hanging from tree branches and outlining the walk way to the altar.
We're also told that unlike tradition, Ashlee is opting against having the typical matching dresses when it comes to her bridesmaids.
Speaking of Diana Ross, the source adds that she's been very hands-on with the wedding planning, especially since it's her baby boy's first wedding.
While the duo are planning a gorgeous ceremony, Ross has admitted that all of that doesn't really matter—he just wants to marry his ladylove!
"Honestly, we could go and get married right now, wherever," Ross told E! News while promoting his indie, The Wilderness of James, at SXSW. "We just want to be married. We're in love. This is the most incredible time I could ever think of in my life and I'm young, but the same time, I've lived a different life than most and I can't think of a happier moment."
Ross, who plays Messalla in the upcoming Hunger Games: Mockingjay, says he knew he wanted to marry Simpson "really quickly."
"I was giving it time only because I wanted to give it time, but I would have asked her a month after I was with her," he said.
He popped the question in January after about six months of dating. So cute!