NICKI MINAJ posted two videos of a rather large backside twerking.  One was captioned, "This ain't me. It's a friend of mine."  But she was probably kidding.  It's most likely hers.

DAVE NAVARRO Tweeted a picture of himself touching tongues with his ex CARMEN ELECTRA Wednesday night at a heavy metal award show.  He captioned it, "May get lucky with this one tonight!"

But a source says they're NOT back together, they're just still really good friends.

One thing I always have time for:  MIRANDA KERR in a SEE-THROUGH top. 

CIARA shows off her baby bump in "W" magazine.