Benji and Joel Madden enjoyed a double date on Valentine's Day.

Benji Madden and Cameron Diaz

Benji Madden and Cameron Diaz

The brothers dined at Il Ristorante Di Giorgio Baldi in Santa Monica, California alongside their wives - Cameron Diaz and Nicole Richie.

A source shared: "Cameron is a regular and looked bella. She seemed excited to be celebrating her first Valentine's Day with Benji.

"She and Benji looked very happy. They had a fun, three-hour dinner with Nicole and her husband."

The two couples enjoyed their Valentine's meal together and were such regulars at the restaurant, they didn't even need to check out a menu before ordering.

The source added to People magazine: "They didn't even look at the menu and instead ordered their favourites, including ravioli agnolotti with white truffle, lobster and Spigola."

Meanwhile, Cameron and Benji - who tied the knot last month after less than a year of dating - recently spent their honeymoon in Wyoming "eating fried chicken in their sweatpants".

A source said at the time: "Cam and Benji had a very low-key honeymoon in mountainous Wyoming where they stayed in a cosy cabin and ate fried chicken in their sweat pants.

"It was exactly what they needed post-wedding as they just want to hibernate."