It seems that Katy Perry has called on her best mate Rihanna to help her through her divorce. Apparently as soon as Ri heard the news she called Katy and invited her to Barbados to stay with her and her family. Rihanna, of we ever get divorced, can we come on holiday for free with you? Please? A source said: "Katy is hardly speaking to anyone right now, but she called Rihanna as soon as she heard Russell was filing for divorce. Katy was embarrassed about calling her parents as they'd been so against Russell in the first place, but Rihanna was a great support for her and she really helped to calm her down. When Katy told her the news, she suggested flying down to Barbados to stay with her and her family." Katy and Rihanna are such good friends that Rihanna was meant to be Katy’s maid of honour, but didn’t actually end up going to the weeding – we hear this was because of work commitments, and not because she was against it or anything like that! It was last Friday that Russell Brand filed for divorce from Katy Perry, giving the reason of irreconcilable differences. There have been various rumours around this – unsurprisingly. Some saying that Katy had no idea he was going to do it. Others saying that she told him to do it rather than her because she knew her parents would feel let down as they are so religious and don’t believe in divorce. There are even some people saying the Russell wanted to start a family, but Katy wasn’t ready, and this was the reason for their split. Russell’s statement simply said: "Sadly, Katy and I are ending our marriage. I'll always adore her and I know we'll remain friends." Things didn’t look good before the statement was released though, when they were spotted spending Christmas on opposite sides of the world, and not wearing their wedding rings.