When Lily is upset to realise Matt is going out with cool girl Greta Masters, Jas plans a make-over slumber party to cheer her up.

Unfortunately it clashes with a rare Comet sighting, which Martha and Ollie are desperate to experience. They have even been allowed to borrow the very precious school telescope for the evening.

Ollie is smuggled in to Lily's house by Martha to watch secretly from the attic, with Martha planning to split her time between both events.

After much chaos and confusion, and with the presence of Ollie in the house rumbled, a compromise is finally reached, where the girls all get to do both the make-over and watch the rare comet.

At the end of the make-over session Martha and Jas are horrified to see Lily has transformed herself to look exactly like Greta in a bid to impress Matt. To spare Lily's feelings they pretend to like her new look, but are relieved the next day in school to see Lily returned to her normal, natural self. Lily has realised it's better to be yourself, rather than try and change who you are just to please others.