Maria Shriver Celebrates 'Beautiful & Brilliant Daughter'
05/20/2011 AT 12:35 PM EDT
"Congrats to my beautiful & brilliant daughter, @kschwarzenegger, for receiving the GirlPower Award from A Place Called Home today," Shriver, 55, Tweeted Thursday night after taking nearly a week-long break from Twitter in the wake of the news that her husband Arnold Schwarzenegger fathered a child during an extramarital affair.
Shriver and Katherine, who wrote "Rock What You've Got: Secrets to Loving Your Inner and Outer Beauty from Someone Who's Been There and Back" last year, were joined at their table by sister Christina, 19, during the luncheon benefiting A Place Called Home, a non-profit youth center in South Central Los Angeles.
"Maria was smiling and very proud," says event planner Marsha Grant.
Adds a source: "They are extremely close."
Among the other people honored at A Place Called Home's "Women Who Inspire Us" luncheon at the Beverly Hills Hotel on Thursday include journalist Laura Ling and Pamela Skaist Levy, the founder of clothing company Juicy Couture.
For more information on A Place Called Home and their mission, visit apch.org.
Reporting by LIZ MCNEIL