It's no easy task for Hollywood couples to stay happily married for more than 10 years.
"To be with one person for a very long time actually gets more interesting," the actor told E! News at The Bling Ring premiere. "I'm into that. She's a great girl. I'm lucky."
With their relationship stronger than ever, could the happy couple be expanding their family with more kids?
"I don't know," Rossdale said with a smile. "Maybe tonight, who knows?"
In the meantime, the proud dad is looking forward to spending Father's Day with his wife and two kids, Kingston and Zuma.
"She's always got a surprise," he said. "I'll just let it roll. I let it reign on me in a beautiful way."
For more from The Bling Ring premiere, watch E! News tonight at 7 p.m. and 11:30 p.m.