In fact, both of their ensems resembled something you'd wear to sleep after brushing your hair exactly 100 strokes inside your fancy boudoir!
There's no doubt that Lorde was pretty much in a pair of silky Givenchy pajamas complete with lace-paneled nightgown and very comfy-looking pants.
The best part is she can just jump into bed without undressing after the party!
Demi's Zac Posen frock was slightly more formal, and featured a keyhole cut-out at the neckline and perforated panels throughout.
BTW, the 52-year-old looked like she just stepped out of the Fountain of Youth — her hair and skin are immaculate!
Check out more shots in the gallery (above)!
[Image via WENN.]