'controversy' [n] : a contentious speech act; a dispute where there is strong disagreement
I think Kate has caused many 'disputes' here (esp. on the t.A.T.u. forum) with 3 or 4 people strongly disagreeing from her, for saying stuff like t.A.T.u. can't sing
So, taking in account the diversity of people that were here in 2004, I'd say she starred in some controversial moments.