That's what I found in Wikipedia : 'Coccinella septempunctata, the seven-spot ladybird (or, in North America, seven-spotted ladybug or "C-7"[1]), is the most common ladybird in Europe. Its elytra are of a red colour, but punctuated with three black spots each, with one further spot being spread over the junction of the two, making a total of seven spots ';
Beautiful creatures, but I don't wanna have an infected house! :-).
Thanks for the reply!