Well, it seems this big sis wasn't having any of it!
Koko took to Twitter on Monday with a very cryptic message about all the "sh*t", writing:
[Image via Instagram.]
The pop star is looking extra hot these days with her red hair, and we're sure guys are going to be all up on her bass throughout the night!
But any creeps who were planning on drunkenly hitting on the songstress were probably discouraged after Trainor's sexy performance of No!
Taking the stage with a team of backup dancers, Meg strutted her stuff to the sexy yet empowering track!
Like Meagan Good said while introducing the performance, we have a feeling many girls will be singing this song tonight during the after parties! LOLz!
Ch-ch-check out the performance (above)!