Katherine Schwarzenegger has her brother Patrick Schwarzenegger's back.
She's all for his romance with Miley Cyrus.
"I approve of whatever makes my brother happy," Katherine said about the relationship at last night's premiere of Dior and I.
Is her brother happy right now?
"He's a 21-year-old college kid, how could he not be?" Katherine said.
Maria Shriver and Arnold Schwarzenegger's oldest child certainly was happy last night.
She had never work Dior until she slipped into one of their dresses last night.
"It's my first time!" Katherine said. "I lost my Dior virginity."