it was probably one of those ridiculous media, publicity magazines. They hardly ever tell the truth and always stretch everything.
So no lol it's probably not true.

It's probably because, Nikki and Robert are sleeping together, but he is still flirting with other cast members, mainly Kristen. So Nikki is pissed off!

first of all don't listen to alice_president. they aren't sleeping together. they are having a cat fight because when he hangs out with one of them, they having fun and stuff, but once they have to go, he will go straight to the other one. and i guess they are jealous of him being with the other. and also heard that once, kristen was hanging out with taylore lautner and then a bunch of girls saw him and started coming up to him, and she just gave them dirty looks until they left.