Sister-in-Laws Cameron Diaz & Nicole Richie Enjoy a Pampering Session Together!

Cameron Diaz and Nicole Richie make their way out of a salon after getting mani-pedis together on Thursday (September 8) in Studio City, Calif.

For those that don’t know, the ladies are sister-in-laws – Cameron is married to Benji Madden and Nicole is married to his twin brother Joel Madden.

Cameron took to her Instagram account a week ago to pay tribute to Gene Wilder after he passed away.

“He was such a light.. Incandescent…Luminous… Brilliant…My heart feels so much joy just from the thought of him.. He was truly a special soul… Thank you, Mr. Wilder for sharing your light with us all..” she wrote.

15+ pictures inside of Cameron Diaz and Nicole Richie at a salon together…