Hillary Clinton mingled with Hall of Fame basketball player Magic Johnson and Apple CEO Tim Cook, vamped in a photo booth with actor Justin Timberlake and dined with some of California's richest families on what was likely the most lucrative fundraising swing of her presidential campaign.

The Democratic presidential nominee raised $18 million on a three-day trip through California, or roughly $270,000 an hour.

Democratic presidential nominee Hillary Clinton collected $18 million in just three days during a tightly controlled fundraising swing through California

Clinton had star power on her side, leveraging talent from the likes of Justin Timberlake and Jessica Biel to open the wallets of the well-heeled in Hollywood

Clinton arrived in style in Orange County, California on Tuesday before a string of fundraising parties and dinners where the price of entry was as much as $100,000 per couple

The visit to the West Coast comes amid a prosperous August for Clinton's campaign, with the candidate and her surrogates hosting at least 54 events over the final two weeks of the month, according to a fundraising schedule obtained by The Associated Press.

A weekend trip to Cape Cod featured stops at seaside estates and a Sunday 'summer celebration' with the pop star Cher.

Clinton is trying to use the relatively quiet month of August, when voters are more focused on vacation than politics, to fill her campaign war chest.

In the Golden State, many of her events were at well-worn stops on the Democratic money trail. In Los Angeles, she stopped by Johnson's Beverly Hills compound, where she spoke to the 500 supporters gathered outside.

Then she headed a few house down the street to entertainment executive Haim Saban's sprawling property, where she was feted at a 100-person dinner on grounds that included some of Saban's lighted animal-shaped topiary. The price of admission: $50,000 a plate.

President Barack Obama had visited the same homes in 2013. But unlike Obama, who allows reporters to observe some of his opening remarks to donors, Clinton leaves the press waiting outside in vans and guesthouses, giving no hints at what she might be telling some of the country's most powerful people.

Behind closed doors, Clinton soothed the worries and answered the questions of some of her most ardent backers.

Clockwise from top left, Apple Computer CEO Tim Cook, actor Tobey Maguire, pop singer Cher and NBC legend Magic Johnson all partied with Hillary and helped swell her campaign war chest

Multi-million heiress Maya Henry (right), 15, posted some beautiful Instagram pictures from the event, including one with former Friends star Jennifer Aniston (left)

Composer Chloe Flower shared the moment Justin and Jessica gave a joint speech while a beaming Hillary Clinton stood on stage next to them

And that's all your seeing: Clinton - unlike Obama in 2008 - has held her fundraisers under conditions of intense secrecy

At an intimate Bay Area dinner for 30, one donor asked about 'healthers,' likening the unfounded rumors about Clinton's health to the so-called birthers who questioned Obama's birthplace.

Outside the Piedmont mansion, a crowd of children and their parents waited over two hours for Clinton, chanting her name in the chilly night air.

Clinton emerged from the home and, for about a few brief moments, campaigned. She made her way down the hastily assembled police line, shaking hands, snapping selfies and admiring the homemade signs.