Bold and beautiful singer Rihanna has tweeted a hot pic of herself while holidaying in Barbados.Rihanna can be seen closing her eyes, holding back her hair and giving a sexy pout.Yesterday, she was spotted in a lime-green halter dress, which was way too covered by her standards. But today the diva got back to flaunting her curves in a two-piece.She flew to the Caribbean last week after finishing her Loud Tour in London.The singer had tweeted: "Barbados will always be home sweet home!!! I've been waiting for this moment!!! I can't believe it's real!"Rihanna's scorching hot advertisement for Armani Underwear has been voted as the sexiest of 2011. The raunchy promo was hailed the best of the year in a poll of advertising industry chiefs carried out by US magazine Advertising Age.