Breakfast Links: Katy Perry's Dangerous Dance Routine; Trista Sutter on Jake & Vienna

•Katy Perry gets 17 stitches after injuring her leg in a dance routine. (PopEater)

•Harry Potter star Daniel Radcliffe mistakes Justin Bieber for a woman. (Just Jared)

•Is Christina Aguilera copying Rihanna or Lady Gaga? Rihanna's stylist weighs in. (New York Daily News)

•Mom-of-two Jennifer Garner is "absolutely not pregnant". (CNN)

•Trista Sutter is not "surprised" by Jake Pavelka and Vienna Girardi's split. (Extra)