Eddie Cibrian and LeAnn Rimes on August 28, 2012 in Malibu, California. Credit: AKM-GSI

The older she gets, the tamer she becomes.

To celebrate her 30th birthday August 28, LeAnn Rimes and her husband, Eddie Cibrian, 39, decided to forgo hosting a blowout bash in favor of a cozy dinner date at Nobu in Malibu. "They looked really happy and were talking a lot," an onlooker tells Us Weekly. "He was really animated and she was beaming."

The casually-dressed couple shared a bottle of wine and several sushi dishes while dining a deux. "They looked really happy and were constantly talking," the onlooker tells Us. "They held hands across the table at some points."

Turning 30 reminded Rimes how much she values those around her. "If there's one thing I know, it's that I'm loved," she tweeted. "Thank you all my family, friends and fans for all the birthday wishes!"

Rimes began celebrating her milestone birthday one week earlier during a beach bash August 21; the bikini-clad country singer tweeted several photos from the Don Julio tequila-sponsored party.

Rimes and her Northern Lights costar Cibrian tied the knot in April 2011. Both married when they began seeing each other, Us exposed their affair in the spring of 2009. Since then, Rimes has made peace with her ex, Dean Sheremet, and Cibrian's ex, Brandi Glanville, engaging in friendly Twitter exchanges and occasionally attending the same events on behalf of Mason, 9, and Jake, 5, Glanville's two sons with Cibrian.