And we love how old Hollywood glam she looks!
The long sleeves and full skirt with the low-neckline are perfection, just like her mirrored clutch and H. Stern diamond earrings.
Though we would have preferred to see Diane opt for something other than her white Stuart Weitzman heels, we think she did a pretty fab job!!
Of course, without hunky luvah Joshua Jackson by her side, it’s hard to say whether her outfit was truly complete. LOLz!
[Image via FayesVision/WENN.]