I think we all would like Rihanna as our big sister she throws amazing parties and also gives out sex advice to your mates. In a club in the west end of London, Rihanna threw a party for her little brother as it was his 22nd birthday. Rorrey's is actually trying to hit the big time himself with a music career, but for now, he has his big sister to throw him lavish dos. Rihanna was obviously on a high after her concert in London that night, and clearly thought she hadn't done enough singing, as at the birthday party, she grabbed the mic and joined in on a celebratory sing song. She then made a bit of a speech, which may have got a little bit embarrassing for her brother. She said: "I left home at 16 and had to learn to look after myself. Always use a condom." Well, good advice even if it is a bit unusual. She seemed to be aiming her advice at her brother and his mates, and the group of girls that had surrounded them. The boys and girls got through 15 bottles of champagne and 6 bottles of vodka, and even at that point they didn't stop. Rihanna took them back to her suite at her hotel her brother his mates, and all the girls who had joined them. A source said: "Rihanna is the best big sister. She sorted for all these girls to accompany her brother back to her hotel, along with his friends too. They had a great time and she treated them like kings." We'd like Rihanna to throw us a party please!