Cameron Diaz was dressing a little more conservative than her usual California-girl style on the set of My Sister's Keeper in LA yesterday with her co-stars. It still seems a bit odd to think of her playing Abigail Breslin's mother, but at least we know she'll be the hottest (and leggiest) mom on the block. I'm sure one Mr. Butler would agree — especially after their little A-List double date at Chateau Marmont over the weekend. According to Life & Style, the supposed new couple dined with Reese and Jake out on the patio, enjoying a lengthy laugh-filled evening. We do love celebrity-couple friends, now let's just hope that next time around we get to see them all out together.