Nicole Richie set Benji Madden with Cameron Diaz

Los Angeles: Socialite Nicole Richie has taken responsibility for setting up her brother-in-law Benji Madden with his new lady love Cameron Diaz. The `Good Charlotte` rocker and actress Diaz sparked rumours of a new romance when they were spotted spending time together in May, reportedly. Now, Richie, who is married to Benji`s twin brother Joel, has opened up about her matchmaking project. "I approve of anything that`s going to make Benji happy. I am a devoted sister-in-law. I`m happy for anyone who is happy, and I want everyone to be surrounded with love," the fashion designer said. When questioned if she was the one who officially set Madden and Diaz up, Richie admitted, "Yes. I`m going to take responsibility for everything!" Diaz recently took their relationship to the next level by introducing the rocker to her whole family during a reunion in Florida over America`s Independence Day holiday weekend.