Sofia Vergara

Soon enough, two of Hollywood's hottest stars are going to be officially off the market.

As the countdown to Sofia Vergara and Joe Manganiello's highly anticipated nuptials continues, E! News learns details about the bling that will soon be rocking these lovebirds' fingers.

To keep in line with the theme of the engagement ring, we're told jeweler to the stars Lorraine Schwartz will be designing the pair's wedding bands as well. And if it's anything like that sparkler Joe gave his leading lady when he proposed, these diamond additions definitely won't disappoint.

On Sunday, the most lavish celebrity wedding of the year will take place in Florida—and the festivities are already under way!

We've been told that around 400 guests are expected at Joe and Sofia's nuptials, thanks in no small part to the bride's "huge family" and the couple's big pack of friends. "They've invited many co-stars, including Reese Witherspoon, Ed O'Neilland Julie Bowen," a source told E! News. "They want everyone they know and are close to to be there."

The wedding is taking place at The Breakers in Palm Beach, which is known for hosting breathtaking oceanfront occasions—but the spouses-to-be are determined to keep the ceremony intimate despite the size of the party.

"It's a nighttime affair and they want to make sure it's very private," a source says. "They have hired a ton of security and made everyone sign confidentiality agreements. They don't want any [unauthorized] photos to be obtained and are taking great measures by doing everything inside on the night of the wedding."

Can't wait to see these two say, "I do!"