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If there's one thing celebrity babies and cars have in common, it's their bizarre names.
Can Holly Willoughby tell them apart?
Well, we put the mum-of-three to the test when she came in for a chat with Heart to talk all about her new book 'Truly Happy Baby', and it seems telling the difference between the two is a lot harder than you would think!
So is Moon Unit a car or just a trendy celebrity baby name? Watch and find out.
'Truly Happy Baby - It worked for me' by Holly Willoughby is £16.99 and is on shelves now.