After furter reading I am not sure anymore. There are usually one or two amorous males in the female's web as well as one or more tiny spiders with silver triangular abdomens. These are called dewdrop spiders of the genus Argyrodes (family Theridiidae) and they clean the orb-webs of prey too small for the host spider.
I am not sure which of the two is featured here seeing that I do not have a photo of this smaller one that shows it clearly. ... wonder why. :)
This spider was at least 10cm in size. :)))
Homeward bound (62) *