Kuu wrote on Instagram that she's already back in Japan so no she didn't attend 61st Annual Grammy Awards unlike Yamapi & ARASHI's Sakurai who were doing English interview commentary for WOWOW at the red carpet with other celebrities like Zedd
Somemore photos she took/posted
With rapper Fat Joe
https://www.instagram.com/p/BtunHcVAuy8/
With music producer Ty Dolla $ign who created CHANCES ALL
https://www.instagram.com/p/BtuczZjgUSY/