The actress takes her 3-month-old daughter out for an afternoon in N.Y.C. Plus: Lindsay Lohan, Tori & Dean, Katy Perry and more

HOP ON POP

Katy Perry gets a little carried away after a night out with British pop star Mika on Tuesday night in London. The two met up (and partied together) at the Serpentine Gallery's annual summer party in Hyde Park.