George and Amal Clooney are throwing a post-wedding party in Buckinghamshire Saturday night.

The newlyweds, who got hitched last month, are having another celebratory bash at the historic Danesfield House Hotel and Spa, so that the brunette beauty's extended family can meet her hunky spouse.

A family member told PEOPLE.com: "We're so proud to have George in the family that I'm travelling from Beirut to London just to kiss him and say, 'Welcome!' "

It is believed around 200 guests are jetting in to the UK from Amal's native Lebanon, Saudi Arabia and Bahrain to celebrate the couple's marriage.

A large white marquee was erected at the five-star countryside hotel, which sits on 65 acres, for the private festivities in recent days, and crates of champagne, white lilies, purple orchids and mini white roses were delivered Friday morning.

The 'Monuments Men' star, 53, was spotted arriving at Heathrow airport in London Friday morning and seemed eager to see the human rights lawyer, 36.

An eyewitness said recently: "George seemed very relaxed and casual, he was so low-key that hardly anyone recognised him! George looked very happy to be back in the UK and seemed excited about the prospect of being reunited with Amal."

The couple, who started dating in October 2013, tied the knot in a lavish ceremony in Venice, Italy, on September 27, following a five-month engagement.