A look at the wierdest dressed celebrities during performances. From Rihanna to Ben Stiller, where did they all go wrong? Is it the costume or the way they have worn it? Are the costumes relevant to the respective occasions or did they make a fool out of themselves?

When there is a function to attend every other day, can you blame the celebrity for overdoing it? Who were the designers by the way?

Ben Stiller presents the award for best makeup during the 82nd Academy Awards in HollywoodReuters
Grace Jones arrives for amfAR's Cinema Against AIDS 2010 event in AntibesReuters
Zellweger poses on arrival at the Metropolitan Museum of Art CostumesReuters
MTV's 2012 Video Music Awards (VMAs) nominees have been announced and Rihanna's duet with Drake, "Take Care" is a front-runner with five nominations including Video Of The Year, MTV.com reports.Reuters
Lady Gaga performs during the 2009 MuchMusic Video AwardsReuters
US actress Eva Longoria Parker during the MTV Europe awardsReuters
10 things you need to know about Katy Perry.Reuters
Gene Simmons' sex tapeReuters