Even a world singing superstar like Rihanna needs a bit of help sometimes.And the 23-year-old star was grateful when one lucky man came to her aid earlier this week, when he helped her tuck her slipping towel round her waist as she relaxed on a Brazilian beach.Wearing a patterned strapless bikini and with her long curly hair tied up with a headscarf, the star waited patiently for the friend to wrap the striped towel around her in Rio de Janeiro.
