And the 19-year-old continued, sharing her reaction when the reality TV starlet called her out:
[Image via Glamour Magazine.]
The best way for her to make a grand entrance at the party was to show up with both nipples exposed, so RiRi arrived in a black fishnet top with NOTHING underneath. No bra, no paisies, just nips!
While she did spend some time with a black blazer hiding her breasticles, she had no problem stripping it off and posing for pics.
And since we know you want more, see additional photos from her night (below)!
[Image via Instagram.]