How do Katy Perry and ‘Jersey Shore’ star Deena’s bare bums compare to Kate Middleton’s dress disaster?

As the weather gets hotter, the dresses get smaller and it only takes a split second to get caught showing a little too much skin — it even happens to royalty!

A gust of wind nearly revealed Kate Middleton‘s royal rear-end in Calgary July 7 while on the Royal Tour, and now two more stars have experienced a public booty blunder!

Katy Perry flashed her backside while at the Smurfs premiere in NYC July 24, and Deena let it all hang out while partying in Seaside Height, New Jersey.