Celebrity Pictures: Madonna, Katy Perry, Nikki Grahame

Published Jun 17 2012, 18:34 BST  |  By Donna Cini

Today's (June 17) celebrity pictures include Madonna performing in Italy, Katy Perry rehearsing in Canada and Nikki Grahame taking part in a new reality series.

Madonna continued her world tour with a performance at the Artemio Franchi Stadium in Italy. The venue was sold out as fans gathered to see the pop icon's latest show.

Meanwhile, Katy Perry was rehearsing for her appearance at the MuchMusic Video Awards in Canada. Katy's video for Last Friday Night (T.G.I.F.) is nominated in the 'International Video of the Year' category.

In Dublin, Big Brother star Nikki Grahame was busy filming TV3's Celebrity Salon. Other contestants on the show include Brookside's Phillip Olivier and original Geordie Shore cast member Greg Lake.

See all of our celebrity pictures from this weekend in the gallery below: