Inside Chelsea Clinton's Wedding Weekend

Here comes the bride!

Chelsea Clinton will say "I Do" to her beau of about five years, Marc Mezvinsky, 32, Saturday evening in bucolic Rhinebeck, New York.

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In anticipation of high-profile guests at the luxe wedding -- estimated to cost $3 million -- two helicopter landing pads have been installed at Astor Courts, the ultra-private Hudson riverfront estate where the nuptials will take place.

Several other of the 500 attendees will have a more low-key arrival via bus. They'll be picked up from local inns Saturday afternoon to be whisked away to the mansion, which is set back from the road with a long driveway protected by off-duty police officers.

Chelsea, 30, and her parents Bill and Hillary won't have too long of a commute.

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Despite reports they are bunking with the Andrea Colombel, the daughter of billionaire Clinton supporter George Soros, an insider tells UsMagazine.com: "The Clintons will all be staying at Astor Courts."

Colombel confirms to Us' it's "not true" the former president and Secretary of State ever planned to stay at her home, Glenburn. "We wish [Chelsea and Marc] the best," she adds.

Guests began to trickle into the Hudson Valley town ahead of the rehearsal dinner, set for Friday night in a barn at Grasmere. (Those not invited may be having cocktails at the sold-out Beekman Arms hotel, which closes at 8 p.m. for a private event.)

An insider says local hotels haven't even been given the names of who will be checking in.

"When the guests arrive, they'll tell the front desk the room number they were assigned and will get their room key. All of the guests received an email verification about their room," says an insider at one of the completely-booked local hotels, paid for by the Clintons.

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Out-of-town attendees received a small box of chocolates from Samuel's and wine from Clinton Vineyards.

"It's white, it's called Tribute and it's a Seyval Blanc. It's the 2009 vintage," Rita Flood, who works at Clinton Vineyards, tells Us. "It's called Tribute for two reasons: one, initially, the owners called it Tribute to recognize the fact that they harvested their grapes on 9/11, and it was released in tribute of those who died in 9/11. And another tribute to honor the founder of Clinton Vineyards, Ben Feder."

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Bill Clinton made his first public appearance in town Friday afternoon at Gigi's Hudson Valley, which is one of the local caterers to provide food at the rehearsal dinner. Us witnessed secret service agents checking out the local restaurant Thursday night.

Says Valerie LaRose, who runs The LaRose Bed & Breakfast up the road from Grasmere: "Grasmere and the barn is really nice. Catering trucks have been driving down the road for days. They all have tape covering the vendor names so you can't tell who is coming and going. The only truck that wasn't covered up was Gigi's."

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The rehearsal dinner space has been decorated "really simple," says an insider.

The wedding will happen early Saturday evening, around 6 p.m.

"For a small town, this wedding is a big deal," says Tarren Manfredi, an employee at Merriweather's in downtown Rhinebeck, which has a sign in the window urging rumored guest Oprah to pick their handmade soap as her favorite things. "We're so happy they came here."