She was joined by the last five Eurovision winners from 2007 to 2011 which included Marija Šerifović , Dima Bilan , Alexander Rybak , and Ell & Nikki .
She was joined by the last five Eurovision winners from 2007 to 2011 which included Marija Šerifović , Dima Bilan , Alexander Rybak , and Ell & Nikki , perfoming a medley of their winning song entrys and a rendition of classic `` Waterloo '' .