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Dream cameo for Britney as Glee episode attracts 13.5m

Britney Spears had a dream cameo on the hit TV musical Glee.

The episode, which aired on Tuesday in the US and featured the star in some dream-sequence cameos, drew an estimated 13.5 million viewers. it was the second most-watched episode of the show ever, behind last spring's return from a break.

That's also an increase from the 11.1 million people who had tuned in to the Glee season premiere a week earlier. Spears was also a trending topic on Twitter during the show, exemplifying one of TV's biggest new trends: viewers using social media to chat with friends while watching. The cast performed five Spears songs during the episode, including I'm A Slave 4U and Stronger.