Katie Holmes, left, and husband Tom Cruise are seen at the MTV Movie Awards on Sunday June 1, 2008 in Los Angeles. [Agencies]

When you buy a Beverly Hills estate for a reported $35 million, you don’t just throw any old housewarming party.

Tom Cruise and Katie Holmes hosted a lavish, over-the-top housewarming last night for more than 500 guests. The couple and their daughter, Suri, recently moved into the 10,000-square-foot home with seven bedrooms and 10 bathrooms, which they purchased last year.

The party was a who’s who of A-listers. Reese Witherspoon showed up holding hands with boyfriend Jake Gyllenhaal. Kimora Lee Simmons, wearing a red cocktail dress, arrived with Djimon Hounsou. Eva Longoria Parker, in canary yellow cocktail dress, brought her sister as her date. Prince, Sean Combs, Kirstie Alley and Oprah Winfrey all attended the bash.

Many of Cruise’s former costars also came to celebrate, including Tobey Maguire (Tropic Thunder), Ben Stiller (Tropic Thunder), Dakota Fanning (War of The Worlds) and Cuba Gooding Jr. (Jerry Maguire). And, of course, there was family: Cruise’s mother and sister were among the first guests to arrive.

It was no small feat pulling off this party. Crews from Town and Country events had been setting up tents in the backyard of the new TomKat compound for days. An army of valets were on hand, as were eight police officers to direct the stream of limousines that began arriving around 8 p.m.

The Cruises spared no expense for this gathering. Famed chef Wolfgang Puck catered the event and a full band provided entertainment. Every contingency was thought of, even an ambulance and EMT unit were on hand just in case they were needed.