Kate and William arrive in Los Angeles for US trip

LOS ANGELES — Bathed in sunshine and under clear blue skies, the Duke and Duchess of Cambridge arrived Friday in Southern California's vacation playground. But within minutes of touching down, they were whisked off to work.

The royal couple had tacked on a quick visit to Los Angeles following a nine-day tour of Canada, their first foreign trip since marrying in April.

Aside from a game of polo in the seaside city of Santa Barbara, much of the couple's three-day visit will focus on business and not pleasure. Instead of trips to the Hollywood sign or Malibu's beaches, their itinerary includes some hefty fundraising for good causes, promoting U.S. investment in Britain and charitable work.

1. Stories from
   1. 
   2. Reese Witherspoon Shows Off Her Baby Bump at Cannes
   3. All the Details on Beyoncé's Atlantic City Concert Costumes
   4. Will Smith Terrified of Willow Dating
   5. Pedro Hernandez Charged with the Murder of Etan Patz
   6. Kaela Humphries Changes Her Athlete's Diet - and Loses 40 Lbs.

The newlyweds landed shortly before 4 p.m. in a Canadian military jet. The former Kate Middleton, who left Canada in a red satin and wool scarlet coat-dress by Catherine Walker, changed aboard the flight and emerged wearing a light-gray, knee-length dress with asymmetric draping at the shoulder. William wore a navy blue suit with a purple tie.

Their arrival was a lower-key affair compared to the largely rapturous welcomes they received as they crisscrossed Canada. A small group of officials including California Gov. Jerry Brown and his wife Anne Gust, Los Angeles Mayor Antonio Villaraigosa and Britain's ambassador the U.S., Sir Nigel Sheinwald, greeted the couple at the airport.

They climbed into a black Range Rover and headed for their first event, a technology summit in Beverly Hills aimed at promoting U.S. investment in British tech firms.

Zoomed along by a California Highway Patrol motorcade, the duke and duchess avoided rush-hour traffic on the 12-mile route by staying off the ever-clogged west Los Angeles freeways.

The summit was set up to generate support for Tech City, London's answer to Silicon Valley. The area around the trendy Old Street part of east London is quickly becoming a hub for technology and software firms.

Before their arrival at the expo, former "Dancing with the Stars" contestant Chelsea Kane, "Body of Proof" actress Dana Delaney, "Rush Hour" director Brett Ratner, Dallas Mavericks tycoon Mark Cuban and "Bridesmaids" director Paul Fieg chatted during a panel about social media.

A small crowd of royal watchers gathered outside the hotel as the couple arrived, though the duke and duchess did not stop to speak with them. Attendees stood and clapped as they entered the ballroom and sat on stage alongside other panelists.

Neither spoke during the discussion, though Kate smiled when the panelists mentioned that attendees were welcome to visit Tech City. At the end of the panel, the moderator asked if anyone wanted to talk. Kate nudged William, who shrugged off the opportunity.

Neil Stiles, president of Variety, which sponsored the event, accompanied the couple for brief demonstrations of technology on display at the expo, including the new tablet computer from HP and augmented reality applications from Qualcomm.

"They were delightful company," Stiles said. "They were relaxed, very comfortable in the environment. It was a lot to take in. They arrived at a conference that's been running all day on a very heavy business subject, and I thought they coped with it really well."

Britain's royal family has shown itself to be tech-savvy in recent years and maintains accounts on several social media sites.

1. More about the Royals
   1. DJ Prince Charles hits the turntable
   2. Royal fan, 75, knits model of queen's boat pageant
   3. Prince William barely slept night before royal wedding
   4. Duchess Kate shows off sexy new look
   5. Pup Lupo steals the spotlight at royal polo match

Though Prince William has been to America before, it is Kate's first trip to the U.S. William's late mother, Princess Diana, who would have turned 50 this month, charmed Americans when she visited in the 1980s.

Authorities have put the paparazzi, known for their cutthroat tactics, on notice that aggressive actions will not be tolerated. Photographers were partly blamed for causing the Paris crash that killed Princess Diana in 1997.

Residents in Hancock Park, the exclusive neighborhood that is home to the British consul general where William and Kate will stay, have worked with police to create no-trespass notices for their homes. Any photographers standing on their driveways will be instantly arrested.

A small throng of royal watchers waved flags and cheered as the couple arrived at the residence Friday evening.