'I snuck Britney in through the back door!'

In the opening episode of Season Four, 'There's No Place Like Home', pop star Britney Spears has a guest appearance.

At the time, Britney was just 17 years old and in her first year of fame with a packed schedule but Melissa took her out clubbing to help her have some fun.

Melissa said: "I devised a plan to sneak her out of her hotel and then take her dancing so she could chill with people closer to her age, if just for one night. Britney loved the idea! Since then, Britney's been snuck in and out of more back doors than I can count, but I shudder to think that I first showed her how it's done."