Katy Perry couldn't be happier as she met fans and signed autographs outside the London Studios in Waterloo yesterday.

The California Gurls star is still on her promotional tour for her new album, Teenage Dream and filmed her appearance on Alan Carr's Chatty Man TV show.

The singer was greeted by a hoard of fans, desperate to catch a glimpse of their favourite popstar.

Katy didn't disappoint, looking stunning in a LBD with tasselled shoulders and knee high boots, accessorising her look with coloured hair extensions in the colours of fiancé Russell Brand's football team, West Ham.

Will you be getting your hands on a copy of Katy's latest album? We're hooked on the album's title single.

Katy's hot new video...