Tameka is back on the rampage, and this time she’s going in on Usher’s girlfriend Grace Miguel via Twitter!

Usher’s ex-wife Tameka Foster recently appeared on CNN to promote her “Lost One’s” foundation and while the host tried to sidestep and ask about Usher, it was quite obvious, Tameka did not want to discuss her ex.

The R&B superstar was interviewed by Robin Roberts and discussed his divorce from Tameka Foster, Justin Bieber, the death of his mentor, Michael Jackson, and why he no longer employs his mother as his manager.