Bachelorette sweeties Ashley Hebert**, 28, and J.P. Rosenbaum, 35, are giddily gearing up for their walk down the aisle.

A source says Hebert not only scored star planner Mindy Weiss for the December 1 event in Pasadena, Calif. (airing on ABC December 16), she's gaga over her gown: "Ashley can't wait for people to see it!"

Invitees getting the first glimpse include show alums Emily Maynard**, Trista and Ryan Sutter and (awkward alert!) ex-loves Ali Fedotowsky** and Roberto Martinez**.

Hebert and Rosenbaum have also both officially said their goodbyes to singledom: the bride and groom-to-be enjoyed respective bachelorette and bachelor bashes in Scottsdale, Ariz. the weekend of Nov. 17.

"Ashley and JP had their parties at the W, but they didn't celebrate together," a source tells Us Weekly. "The girls had quite the party! They had a stripper for Ashley and everyone got spa treatments."

Meanwhile, the source adds, "The guys hung out and went out for a steak dinner."

On Tuesday, Nov. 27, Ryan Seacrest** joked on his radio show about receiving an invitation to the couple's wedding, which conflicts with the annual holiday concert Jingle Ball.

"I don't know them well. I got invited but…" he said. "That's an interesting scam isn't it? Invite people that you know or don't know so that they have to give you a gift."

This article originally appeared on Usmagazine.com: Ashley Hebert "Can't Wait" for Loved Ones to See Her Wedding Dress!