Today is the day!
To get her fans extra excited, the 19-year-old teased some of the goodies to Snapchat on Thursday. Take a look (below):
[Image via Instagram.]
The stunning Smash star looked beyond seksi in a black satin Theyskens Theory gown with plunging neckline and thigh-high slit.
Keep an eye out for nip slips, y'all!
Katharine completed her femme fatale look with a high top bun and strappy black heels.
It's like vintage J.Lo, but better!
[Image via AP Images.]