(Cover) - EN Showbiz - Rihanna is reportedly keeping her yacht crew awake at night because of her loud and relentless partying.

The songstress is currently cruising on the Mediterranean Sea with friends. Rihanna - who is famed for her wild ways - is said to be disturbing staff on the vessel with her late-night partying.

"The gang stayed up singing and dancing until dawn," a source told British newspaper The Sun. "She's a lovely girl but the crew are only getting a few hours of sleep a night.

"And they have to be prepared to be vigilant and make sure she doesn't get hammered and fall into the sea."

According to the publication, Rihanna and her pals have consumed a lot of alcohol. Her tab apparently included "25 bottles of gold Armand de Brignac Champagne, 60 bottles of Peroni and Corona and ten bottles of tequila".

Rihanna has been using her Twitter page to update fans on her sunny escapades. The stunning singer took to the social networking site to share her musings about her recent travels.

"Why see the world, when you got the beach? (sic)," she teased. (C) Cover Media